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Significance of overbeaming and overranging effects of single- and multi-slice CT scanners Dr. Hans Dieter Nagel, Philips Medical Systems, Germany Abstract Overbeaming (caused by focal spot pemumbra) and overranging (the elongation of the scan range in spiral scanning) are significant dose-increasing factors for MSCT scanner with 4 and more slices. The characteristic features of 24 scanners. To reduce the increased overranging in MDCT, a dynamic z ‐collimator was installed in advanced CT scanners. 5, 9, 10 Shirasaka et al. 11 measured overranging in a 128‐detector row CT scanner (Brilliance iCT; Philips Healthcare, Cleveland, OH, USA) and concluded that the spiral dynamic z ‐collimator is important for unnecessary overrange dose reduction

Téléchargez cette application sur le Microsoft Store pour Windows 10, Windows 8.1. Découvrez des captures d'écran, lisez les derniers avis des clients et comparez les évaluations pour Scanneur Windows To reduce the increased overranging in MDCT, a dynamic z‐collimator was installed in advanced CT scanners. 5, 9, 10 Shirasaka et al. 11 measured overranging in a 128‐detector row CT scanner (Brilliance iCT; Philips Healthcare, Cleveland, OH, USA) and concluded that the spiral dynamic z‐collimator is important for unnecessary overrange dose reduction For scanners with 64 or more sections, this length will be much greater, since overranging increases as pitch or detector collimation increases. Manufacturers have equipped the latest generation of CT scanners (128 sections or more) with over-range dose-reducing innovations that reduce overranging by typically up to 50%, which in the best cases reduces overranging to that of the previous. Un scanner (ou tomodensitométrie) est un examen radiologique indolore. L'appareil émet des rayons X à faible dose, dirigés vers la partie du corps à analyser et produit des images en coupes (c'est-à-dire en tranches) fines. Ces images sont traitées par un ordinateur qui permet une reconstitution en deux ou en trois dimensions. Dans certains cas, la réalisation du scanner.

Overranging and overbeaming measurement in area detector

Scanners, phantom and scanning protocols. Overranging dose was assessed for a second- and third-generation DSCT scanner. The software version of the second-generation DSCT scanner (SOMATOM Definition Flash; Siemens Healthcare, Forchheim, Germany) was Syngo CT 2012B and that of the third-generation DSCT scanner (SOMATOM Force; Siemens Healthcare, Forchheim, Germany) was Syngo CT VA50A Materials and Methods: Overranging was quantified for four 16-section scanners by means of free-in-air dose measurements at different scan lengths. Overrange rotations and lengths at a certain section width were derived for all collimations and clinically used pitches by extrapolation. The effect of reconstructed section width on overranging was analyzed separately. Results were applied to. The latest 320-detector row CT scanner has the widest collimation width (16 cm) within one axial rotation (i.e. volume scan mode) and can dynamically adjust the collimation width depending on scan range (Wide Volume, Toshiba, Japan). The ATCM can be used during volume scan mode. The performance of volume-scan ATCM (VS-ATCM) for a 320-detector CT scanner was assessed using a simple phantom.

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Toute section que vous choisissez s'ouvrira pour vous montrer plus d'informations sur l'utilisation de votre scanner. Afficher tout . Installer ou ajouter un scanneur local. Installer ou ajouter un scanneur réseau, sans fil ou Bluetooth. Vérifier que votre scanneur est installé . Numériser une image ou un document avec l'application Scanneur Windows. Trouver les numérisations. For scanners with 64 or more sections, this length will be much greater, since overranging increases as pitch or detector collimation increases. Manufacturers have equipped the latest generation.

Efficacy of a dynamic collimator for overranging dose reduction in a second- and third-generation dual source CTscanner Ronald Booij1 & Marcel L. Dijkshoorn1 & Marcel van Straten1 Received: 7 June 2016/Revised: 21 November 2016/Accepted: 10 January 2017/Published online: 26 January 2017 # The Author(s) 2017. This article is published with open access at Springerlink.com Abstract Objectives The. TOSHIBA Aquilion CT Dose Management Tools Agenda Aquilion Family of CT Scanners Dose Safeguards Dose Management Dose Reduction Dose Measurement Dose Reporting Where to get more info The Aquilion Family . 7/22/2014 2 SUREExposure: Integrated Dose Reduction Patient Registration Acquisition Dose Safeguards Dose Management Dose Reduction Raw Data Reconstruction Integrated Dose Management. We scanned an elliptical cone-shaped phantom utilizing AIDR3D technique combined with VS-ATCM mode in a 320-detector row CT scanner. The image noise distributions with conventional filtered back-projction (FBP) technique and those with AIDR3D technique were compared. The radiation dose profile and tube current time product (mAs) in three noise levels of VS-ATCM modes were compared. The.

Request PDF | The Effect of Overscanning in Multidetector Helical CT Examination: Comparison between Four 64 Section CT Scanners | PURPOSE To quantify the number of overscanning rotation and. Quels sont les risques éventuels du scanner ? Le produit de contraste : Les complications liées à l'injection du produit de contraste sont exceptionnelles. Bien que cela arrive très rarement, il peut se produire une fuite du produit dans les tissus voisins provoquant la formation d'un hématome et pouvant nécessiter un traitement local. Par ailleurs, il est nécessaire de prendre cer Figure 1. Scanner corps entier chez une femme de 55 ans pour bilan d'une chute par défenestration. Acquisition réalisée à partir d'un scanner 64-coupes couvrant l'ensemble du corps au temps artériel, soit une acquisition de 163 cm en 31 secondes, avec 120 kV, modulation automatique de la dose avec mAs entre 50 et 134, temps de rotation 0,5 s, 64 × 0,5 mm, pitch à 0,868, pour un. a dynamic z‐collimator was installed in advanced CT scanners.5,9,10 Shirasaka et al.11 measured overranging in a 128‐detector row CT scanner (Brilliance iCT; Philips Healthcare, Cleveland, OH, USA) and concluded that the spiral dynamic z‐collimator is important for unnecessary overrange dose reduction Définitions de scanner. Appareil d'imagerie médicale composé d'un système de tomographie (qui donne des images en coupe d'un organe) et d'un ordinateur et qui effectue des analyses de densité radiologique point par point (voxel) pour reconstituer ces images en coupes fines, affichées en gammes de gris sur un écran vidéo

Overranging at Multisection CT: An Underestimated Source

Bouclier Rx : suppression de « l'overranging » pré et post-spirale; X-Care : protection des organes radio-sensibles; Adaptive Cardio Sequence et Adaptive ECG pulsing : réduction importante de la dose pour les examens cardiaques ; SAFIRE : amélioration de la qualité image et réduction de la dose délivrée à l'aide du calculateur itératif SAFIRE, allant jusqu'à 60 %; Un scanner. collimator, overranging is no longer a limiting factor for helical CT scanning. Fast scanning with acquisition collimation of 160 x 0.5 mm can be performed at optimized radiation exposure to patients. References 1 Data sheet EMI scanner, EMI, 1972 2 Data sheet Pho / Trax 4000, Searle, 1976 3 van der Molen AJ, Geleijns J. Overranging CONCLUSIONS: The improved dynamic collimator in the third-generation scanner blocks the overranging dose for more than 50% and is more capable of shielding radiation dose, especially in high pitch scan modes. KEY POINTS: • Overranging dose is to a large extent blocked by the dynamic collimator • Efficacy is strongly improved within the third-generation DSCT scanner • Reducing the number. radioprotection du patient en radiologie diagnostique et interventionnelle; quelques réflexions médicales 1. un problème quotidien , très médiatisé. une menace pour le métier progression de 50% des doses reçues par les patients entre 2002 et 2007 le Quotidien du médecin du 1er avril 2011 le scanner est trop souvent préféré à l'IRM or un scanner corps entier peut délivrer en. (limitent l'effet d'overranging) La méthode de reconstruction itérative + 13 % 100120 220 mGy.cm377 mGy.cm-41 %-50 % . PDL TOTAL : 168 mGy.cm +30 %. Rôle des MERM Réflexivité PATIENT. rédzzction dc Pirradiation azz scanner . ZONE CONTROLÉE ACCÈS RÉGLEMENTÉ Du 2 INSTITUT DE RADIOPROTECTION ET DE SÛRETÉ NUCLÉAIRE . Plan - Maîtrise et Rigueur—- de l'irradiation ; 1.

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Video: Efficacy of a dynamic collimator for overranging dose

Overranging in Multisection CT: Quantification and

MSCT scanners 2 • 1991 Dual slice • 1998 Four slice • 2002 16 slice • 2003 32 slice • today - 64 sub-mm slices - 0.4 s rotation. UKRC 2007 Clinical scanners 3 • Image quality and capability increasing . UKRC 2007 The 3 Fs of CT 4 • Faster • Further • Finer. UKRC 2007 Isotropic imaging 5 • 2D pixel in a CT image represents a 3D voxel • Resolution is ideal when equal in. MR artifacts are considered in three groups here based upon their origin from tissue properties, motion, or technical parameters. Take me to the 1st Artifact Q&A! The individual topics covered in this section are On some scanners, even the placement of the bismuth shielding after the scout was taken (correct method) can lead to increased radiation dose because the scanner is able to adjust to the increased attenuation during the scan. Other side effects are streak and beam-hardening artifacts. The Society of Cardiac CT discourages the use of bismuth shielding during coronary calcification measurements. BACKGROUND AND PURPOSE: MDCT has some specific scan parameters that may systematically increase or decrease radiation dose to patients. This study explored the scan protocol parameters that impact radiation dose in temporal bone MDCT and determined the optimal scan parameters that balance radiation dose with diagnostic image quality. MATERIALS AND METHODS: Using exsomatized cadaveric heads.

Overbeaming and overlapping of volume-scan CT with tube

  1. For scanners with 64 or more sections, this length will be much greater, since overranging increases as pitch or detector collimation increases. Manufacturers have equipped the latest generation of CT scanners (128 sections or more) with overrange dose-reducing innovations that reduce overranging by typically up to 50%, which in the best cases reduces overranging to that of the previous.
  2. g or penumbra effect are also possible contributors to the high radiation doses. Overbea
  3. ation. To prevent the recurrence of this type of incident, a working group was set up by ASN with.
  4. ation and direct conversion is disclosed. The detector includes multiple layers of semiconductor material with the layers having varying thicknesses. The detector is constructed to be segmented in the x-ray penetration direction so as to optimize count rate performance as well as avoid saturation
  5. 9h55 Protocole scanner des temporaux : dosimétrie, overranging et cristallin Pr Jean Rousset, CHRU Brest 10h40 Pause-café 10h55 Indication et résultats du TDM des temporaux pour le bilan des vertiges Dr Elsa Pons, Imagerie médicale HIA Percy 11h40 Comment régler la séquence 3D-FLAIR en otologie Dr Arnaud Attyé, CHU Grenoble, 30' 12h15: Déjeuner Partie II: Physiologie, apport de l'IRM.
  6. Overranging refers to the difference between the user-specified image length along the direction of the patient table (as entered on the scanner console) and the actual scan length, which, in helical mode, includes additional rotations at the beginning and end of the pass that are interpolated to reconstruct the spiral data into planar images (van der Molen and Geleijns 2007). In light of the.

CT Protocol Design. William W. Mayo-Smith, MD, Brigham and Women's Hospital, Boston, MA Updated September 2016 | Download PDF. Computed tomography (CT) scanners have become markedly more complex over the past three decades, with a myriad of new options for performing CT examinations. Technical developments in the past have focused on helical technology, increased speed of gantry rotation. Pitch (CT) Andrew Murphy and Dr Usman Bashir et al. Pitch (P) is a term used in helical CT. It has two terminologies depending on whether single slice or multislice CT scanners are used 1-3. Single slice CT (SSCT) The term detector pitch is used and is defined as table distance traveled in one 360° gantry rotation divided by beam collimation 2. For example, if the table traveled 5 mm in one. Methods of CT Dose Estimation in Whole-Body 18 F-FDG PET/CT Yusuke Inoue 1, Kazunori Nagahara 2, Yoshihito Radiation exposure due to overranging increases the scanner-derived DLP, despite lack of significant stochastic effects, and is considered to be another source of overestimation. When men and women were analyzed separately, the regional DLP method caused mild overestimation and mild. CT Review. STUDY. Flashcards. Learn. Write. Spell. Test. PLAY. Match. Gravity. Created by. caitlin_hilton2. Terms in this set (400) Fourier reconstruction/ filtered back-projection. What is considered an analytic form of image reconstruction? hypoxemia. the condition whereby the patient suffers from a low concentration of oxygen in the blood. symptoms of shock. tachycardia, rapid shallow.

Overranging is of growing concern for newer scanners with wider detectors. 2. Radiation dose due to overranging may be substantial several centimeters outside the planned scan range. 3. Knowledge of overranging is important for optimal choice of scanning parameters. 4. New techniques help limit overranging in clinical practice For single detector computed tomography (CT) scanners, the pitch corresponds to the table feed/collimation. For MDCT, there are two distinct versions of pitch, depending on whether the detector collimation (i.e., beam/4 in 4 detector row multislice CT) or the entire beam collimation is considered . The effective detector row thickness is simply the sum of the widths of the contributing. Scan protocol optimization in different scanner types • Patient preparation • Penumbra and overranging • Contrast timing and dosage • Image reconstruction and post-processing Imaging children can be challenging. Most of the cases are non cooperative patients because of their young age and not instructable. They have high heart rates, which makes . Page 7 of 31 it challenging to image. AbstractThe preference for computed tomography (CT) for the clinical assessment of pulmonary tuberculosis (PTB) infections has increased the concern about the potential risk of cancer in exposed patients. In this study, we investigated the correlation between cancer risk and radiation doses from different CT scanners, assuming an equivalent scan protocol Efficacy of a dynamic collimator for overranging dose reduction in a second- and third-generation dual source CT scanner: Published in: European Radiology: journal of the European Congress of Radiology, 27(9), 3618 - 3624. ISSN 09387994. Author: R. Booij (Ronald), M.L. Dijkshoorn (Marcel), M. van Straten (Marcel) Supporting host: Department of Radiology: Date issued: 2017-09-01: Access: Open.

Schutz der Augenlinse bei Schädel-CT durch Gantrykippung(PDF) CT Parameters that Influence the Radiation Dose

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Radiation Scanner — Excellent solution for nuclear radiation measurement 有异议 Coliy Technology Model 900+:Add functions on the basis of Model900: sound alarming when overranging, computer analysis software in Chinese version ( optional English, German, Italian), current data transmitted remotely to computer for displaying and analyzing, record manually and automatically, Maximum. In 2010, the Alliance for Quality Computed Tomography Working Group was formed to provide information to CT users that enhances the quality of their CT practice. The membership includes academic and consulting medical physicists who specialize in CT imaging, representatives of each of the major CT scanner manufacturers, and liaisons to the American College of Radiology, American Society of. Efficacy of a dynamic collimator for overranging dose reduction in a second- and third-generation dual source CT scanner European Radiology , Jan 2017 Ronald Booij , Marcel L. Dijkshoorn , Marcel van Strate A Review of Present Methodology and Required DICOM Information A Joint Report of AAPM Task Group 246 and the European Federation of Organizations for Medical Physics (EFOMP) August 2019 DISCLAIMER: This publication is based on sources and information believed to be reliable, but the AAPM, the authors, and the editors disclaim any war-ranty or liability based on or relating to the contents of. overranging. EXAMPLE: Measuring an unknown re-sistance Let's assume the multimeter is con-nected to an engine coolant sensor with unknown resistance. (See Fig. 3) Fig. 2 Fig. 1 Let's assume the multimeter is con-nected to the battery and set to the 20V range. The display reads 12.56. This means there is 12.56V across the battery termi- nals. Fig. 3 Start by setting the multimeter to the.

Optimisation et réduction de la dose d'irradiation au

The introduction of 40-slice CT scanners has opened up new possibilities for CT angiography of the supra-aortal vasculature. Imaging can be performed with even thinner slices, and more rapidly, than on 16-slice systems, and images have higher resolution. Conventional protocols for imaging the brain and its arterial supply must be adjusted to profit from these parameters Installation : Scanner de l'Hôpital de Cardiologie - CHRU de Lille Scanographie/M590136 Réf. : vigilance sur l'overranging 1, révision régulière des protocoles (travail sur le rapport qualité image/optimisation de la dose), utilisation de l'ensemble des outils d'optimisation du scanner, importance donnée à la formation technique du personnel, échanges téléphoniques. Exam workload, scanner position, and construction of doors, windows, and so on. Consideration for shielding requirements should account for: When it is clinically necessary to have the patient accompanied by a guardian or family member during a CT procedure, or when other health personnel remain in the room during scanning, the guardian/family member or health personnel must wear appropriate.

Background— Noninvasive coronary angiography with the use of multislice computed tomography (CT) scanners is feasible with high sensitivity and negative predictive value; however, the radiation exposure associated with this technique is rather high. We evaluated coronary angiography using whole-heart 320-row CT, which avoids exposure-intensive overscanning and overranging The overranging is an extra-rotation required on both sides of the planned scan, necessary to acquire the integrity of the first and last images of the region. Due to the nature of the helical mode, the overranging mechanism is always present and responsible of an over-radiation to radiosensitive organs such as the thyroid or testis. With the advent of MDCT, it is playing an increasingly.

Quiz 38: Computed Tomography Patient Radiation Dose Unlocking this quiz will decrease the balance by one, you will not be able to revert this action. Cancel Unloc Overranging is proportional to beam collimation, reconstructed slice width, and pitch, while it is irrespective of a planned scan length . The contribution of overranging to the total CT dose is therefore considerably higher for CT examinations with shorter scan ranges such as pediatric CT and cardiac CT ( 44 ) Considerations for wide collimation CT scanners capable of volumetric imaging in both modes. Jack W. Lambert, Elizabeth D. Phillips, Javier E. Villanueva-Meyer, Lorenzo Nardo, Luca Facchetti, Robert G. Gould. Research output: Contribution to journal › Article. 2 Scopus citations. Abstract.

While the first generation of MDCT scanners provided unprecedented isotropic high-resolution imaging, the 16-, 32- and 64-slice CT scanner types showed differences with respect to radiation exposure issues rather than image quality;4 however, all previous MDCT scanners did not exceed a projected detector width coverage in the isocentre of the gantry rotation of 32 to 40 mm Phantom study shows that 63.5% and 45.5% of the image zone indention can be recovered at helical pitch 63/64:1 and 88/64:1, respectively. An analysis on reconstruction accuracy shows that the images in the extended zone are as good as those within the indented zone, while their other image qualities are quite comparable

scanner. For example, It can monitor the pH or other chemical characteristics of process effluents, and operate valves to intro duce neutralizing agents as needed. This data logging system directly measures the range of electrical quantities that Model 3455A Voltmeter can measure (dc volts, ac volts, and ohms) except that the scanner limits th Efficacy of a dynamic collimator for overranging dose reduction in a second- and third-generation dual source CT scanner By Ronald Booij, Marcel L. Dijkshoorn and Marcel van Straten Get PDF (443 KB

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Objectives: The aim was to define image quality and radiation exposure in the recently introduced 320-row CT of the temporal bone (tb) in comparison to a 16-row tb CT. Methods: A cadaveric head phantom was used for repeated tb volume CT studies (80-120 kV, 25-150 mAs), performed in a 320-row scanner (single rotation, 0.5 mm slice thickness, kernel FC 51) in comparison to 16-row helical CT. Radiology and its Clinical Implementation Mario de Denaro 11 - 15 May 2009 Ospedale Maggiore Trieste Italy Dosimetry for CT 2: Multi Slice Technology. DOSIMETRY FOR CT : Multi slice technology Joint ICTP-IAEA Advanced School on Dosimetry in Diagnostic Radiology: and its Clinical Implementation 11 - 15 May 2009 - Miramare, Trieste, Italy Mario de Denaro Medical Physics Department, Maggiore. Scanner abdominal : étude comparative de l'exposition patient en routine clinique sur des appareils avec et sans reconstruction itérative Radioprotection , Jan 2014 M. Gomes , C. Leroy , S. Lemaire , C. Marmin , S. Mordon , O. Erns

In the modern MDCT scanners this may not be the best option, as the negative dose effects of overranging will increase and the spatial resolution will decrease. Therefore, it is usually more dose effective to keep the pitch as low as possible (<1), and if needed manually lower the tube current van der Molen, A. J. and Geleijns, J., 2007, Overranging in multisection CT: quantification and relative contribution to dose--comparison of four 16-section CT scanners: Radiology, 242, 208-216. Contact Floris van Velden, Medical Physicist Department of Radiology Leiden University Medical Center Albinusdreef 2, 2333 ZA Leiden The Netherland The low inertia of the rotor and vee bearings allows overranging of the meter to twice its rated capacity without damage for intermittent flow variations. Designed for maximum life, carbide rotor shaft and bearings require no lubrication Dual-energy CT data can also be decomposed and then reconstructed to form a simulated (virtual) monochromatic image. Monochromatic refers to the x-ray beam: a monochromatic beam has only a single x-ray energy, versus the real-life polychromatic beam, which has a wide spectrum of x-ray energies. This allows you to play around with the tissue contrast a bit (e.g. lower keV for greater contrast.

Guidelines for paediatric CT examinations ADVICE FROM STUK / SEPTEMBER 2012 Säteilyturvakeskus Strålsäkerhetscentralen Radiation and Nuclear Safety Authority. ISSN-L 1799-9510 ISSN 1799-9510 • ISBN 978-952-478-791-8 (pdf) Translation. Original text in Finnish. Several paediatric radiologists and medical physics experts who are specialized in paediatric CT imaging and also scanner. • A Van der Moolen, Geleijns J. Overranging in multisection CT: quantification and relative contribution to dose-comparison on four 16-section CT scanners. radiology 2422007:208-16. • Brenner D, Elliston C, Hall E, al e. Estimated risks of radiation- induced fatal cancer from pediatric CT. AJR Am Roentgenol2001;176:289-96

CT overranging an important but hidden radiation sourc

Medical Physics Radiology supports the medical imaging for nuclear medicine, magnetic resonance imaging and röntgen imaging, including computed tomography. This involves selection, application, protocol optimization and quality control of the existing technologies, but also development and implementation of new techniques and protocols. Medical Physics Radiology pays special attention to the. Multidetector CT scanners were modeled on those from two commercial manufacturers (LightSpeed VCT, GE Healthcare, Waukesha, Wis; SOMATOM Definition Flash, Siemens Healthcare, Forchheim, Germany). Organ doses were estimated for each patient model for routine chest and abdominopelvic examinations and were normalized by volume CT dose index (CTDI.

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Out of the four scanner models, two show a linear decrease in dose with respect to the distance, and the other two scanners show an exponential decay, the authors wrote. Overranging is believed to be the major contributing factor to the observed difference between the two groups. Overranging is the extension of scan length in helical CT beyond both ends of the imaged volume, and the. Objectives: The aim was to define image quality and radiation exposure in the recently introduced 320-row CT of the temporal bone (tb) in comparison to a 16-row tb CT. Methods: A cadaveric head phantom was used for repeated tb volume CT studies (80- 120 kV, 25-150 mAs), performed in a 320-row scanner (single rotation, 0.5 mm slic

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Saltybaeva N, Alkadhi H. Overranging dose reduction by dynamic collimators: evidence from clinical practice, European Congress of Radiology, ECR 2018, 28 February - 4 March 2018, Vienna, Austria. Scientific Journals. Dedulle A, Fitousi N, Zhang G, Jacobs J, Bosmans H. Two-step validation of a Monte Carlo dosimetry framework for general. The first HP low-cost Digital Voltmeter was introduced in a short-form catalog specially edited for the 1966 WESCON exhibition. Its price at introduction was $595; to be compared to the $4,000 for a 3460 at the same time. The 3440A is able to make full-scale DC voltage measurement from ±100.0 mV to ± 1000 V with up to 60% overranging. To save. Reduction of Helical Over-ranging Radiation Dose with Dynamic Collimation on 256-Slice CT , SSG19-01, 8002200, Dianna Bardo

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Direct conversion energy discriminating CT detector with over-ranging correction A CT scanner comprising: a rotatable gantry having an opening to receive an object to be scanned; an x-ray source configured to project x-ray photons toward the object; a detector array having a plurality of detectors designed to provide energy sensitive output in response to detected x-ray photons, the energy. USEFULNESS OF SIZE-SPECIFIC DOSE ESTIMATES IN PEDIATRIC COMPUTED TOMOGRAPHY: REVALIDATION OF LARGE-SCALE PEDIATRIC CT DOSE SURVEY DATA IN JAPAN Daisuke Yamazaki. Department of Radiology, Center Hospital of the National Center for Global Health and Medicine, 1-21-1 Toyama, Shinjuku-ku, Tokyo 162-8655, Japan. Corresponding author: dyamazaki@hosp.ncgm.go.jp. Search for other works by this author.

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Radiation dose in computed tomography (CT) has become a topic of high interest due to the increasing numbers of CT examinations performed worldwide. Hence, dose tracking and organ dose calculation software are increasingly used. We evaluated the organ dose variability associated with the use of different software applications or calculation methods Overranging, Beam Width, and Ramp-Up Time In order to quantify the x-ray tube ramp-up time and overranging for the Siemens SOMATOM Sensation MDCT scanner, the experiment depicted in Figure 3-2 was carried out. The FOC dosimetry system was used with data points being recorded at 0.05 s intervals. Reference fibers were not used since the magnitudes were not of interest; only the timing was of. Scanner geometry, Algorithms. 9A comprehensive evaluation of the dosimetric characteristics of a CT scanner is needed. 9Some z - overscanning (overranging) BC = 16 x 1.5 Overscanning 25 50 75 100 0 2 4 6 8 10 RSW (mm) z - overscanning (mm) Pitch = 0.5 Pitch = 1.0 Pitch = 1.5 Medical Physics, 32:1621-1629, 2005. 100 mv to 1000 v full scale, overranging i300% of scale on four most sensitive ranges, 0 01% stability on four highest ranges 5 digits of data, range function (polarity). channel number. all included in front-panel readout, logged on output recording device 10 CPS to 300 kc. sample period 0 01, 0 1 or 1 sec, accuracy il digit time base 105 db 105 db 105 db 130 db 130 db 130 db Punched card. Scanner Collimation (mm) Largeur du faisceau (mm) GE LightSpeed VCT 64 x 0.625 40 Philips Brilliance 64 64 x 0.625 40 Siemens Definition AS+ 128 x 0.6* 38.4 (*collimation sur 64 détecteurs) Toshiba Aquilion 64 64 x 0.5 32 Tableau 10. Largeur de faisceau en mm pour différents scanners. * Foyer flottant 2.2.3 LA CHAMBRE D'IONISATION À TRANSMISSION 2.2.3.1 CARACTÉRISTIQUES PHYSIQUES La.

The technical parameters for scanning included: (1) for 16-rows CT scanner: 120 kVp, mAs depending on patients' weight (41-60 kg: 200 mAs; 61-80 kg: 300 mAs; 81-90 kg: 350 mAs; > 90 kg: 400 mAs), section thickness 2 mm, pitch 0.813, 0.75 s rotation time, display field of view (FOV) depending on the patient's physique (median values of 350), beam collimation 16 × 1.5; (2) for 256-rows CT. Managing patient dose in multi-detector computed tomography (MDCT). [J Valentin; International Commission on Radiological Protection.;] Home. WorldCat Home About WorldCat Help. Search. Search for Library Items Search for Lists Search for Contacts Search for a Library. Create lists, bibliographies and reviews: or Search WorldCat. Find items in libraries near you. Advanced Search Find a Library. For each scanner model, the X-ray energy spectrum and the structure of the bow-tie filter (beam-shaping filter) were estimated experimentally by the measurement of the half-value layers and the geometric beam profile. Attenuation of the photons in the bow-tie filter was numerically simulated by weighting photons depending on the energy and the emitted angle. A paper describing the experiments. construction and application of anthropomorphic phantoms for use in ct dose studies by james frederick winslow a dissertation presented to the graduate schoo A CT detector capable of energy discrimination and direct conversion is disclosed. The detector includes multiple layers of semiconductor material with the layers having varying thicknesses. The dete

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