Results 171 to 180 of about 5,341 (200)

SU‐E‐J‐41: Measurements of CTDI100 and CTDIvol for MVCT Scans On a TomoTherapy System

Medical Physics, 2013
Purpose: To measure the computed tomography dose index (CTDI) for MVCT scans on the TomoTherapy™ System. Methods: The CTDI100 and CTDIvol were measured using a Standard Imaging A17 ion chamber inserted into a standard CTDI phantom (32 cm diameter and 16 cm diameter acrylic cylinders for body or head CTDI measurements, respectively).
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Modelling CTDIvol through analysis of the localiser image: Towards estimating factors influencing Automatic Exposure Control tube output

Physica Medica, 2018
The purpose of the Automatic Exposure Control (AEC) system in CT is to optimise radiation dose to the patient and provide adequate image quality. Prior to the CT, a 2D X-ray localiser is acquired allowing for an estimation of both the patient size and their attenuation properties; however, acquisition of the localiser is susceptible to patient ...
Matthew Reade, Sean Cournane, Jackie McCavana, Julie Lucey   +3 more
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Comparison of CTDIvol Doses with SSDE in CT Scan Thorax Patients with COVID and Non-COVID Patients

Hellenic Journal οf Radiology
This study aims to determine the comparisson between the radiation dose of computed tomography dose index volume (CTDIvol) and size-specific dose estimate (SSDE) in CT scan thorax for Corona Virus Disease 2019 (Covid-19) and non-Covid-19 patients. The method used in this study is a retrospective study, where the data used is obtained from images of CT ...
Winarno, Winarno, Nurdin, Dezy Zahrotul Istiqomah, Novianjani, Shella, Permatasari, Perwira Annissa Dyah, Anam, Choirul, Astuti, Suryani Dyah   +5 more
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Abstract ID: 167 Assessing the CTDIVOL and SSDE from dose profiles in cylindrical phantoms of water equivalent materials

Physica Medica, 2017
The assessment of the Computed Tomography (CT) radiation output has become a challenge to researchers and technicians due to the rapid evolution of the technology incorporated in CT machines. To guarantee the correct performance and to avoid accidents in CT examinations, the novel CT units require the use of specific phantoms for dosimetry and imaging ...
Alejandro Lopez, Lorena Robayo, Paulo Costa   +2 more
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Trends in the displayed CTDIvol and organ doses in fast kVp switching dual energy CT

2019
Aims and objectives Methods and materials Results Conclusion Personal information ...
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TU‐C‐103‐12: An Experimental Study of the Effects of Different Beam‐Hardening Filters On CTDIvol and Low‐Contrast Image Detectability in a CT Scanner

Medical Physics, 2013
Purpose: To study the effects of different beam‐hardening filters on CTDIvol and low‐contrast image detectability in a CT scanner Methods: The default Molybdenum beam‐hardening filter of GE HiSpeed CT/i scanner was replaced with three different types of filters, having K‐edges in low, middle, and high diagnostic energy range.
A Maghsoodpour, S Aldoohan
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Evaluasi Nilai CTDIvol Dan DLP Pada Pemeriksaan MSCT Kepala Dewasa Dengan Klinis Suspect SNH (Stroke Non-Hemorrhagic) di Instalasi Radiologi RSU Prima Medika Denpasar

Jurnal Ilmu Kedokteran Dan Kesehatan
Abstrak: Evaluasi Nilai CTDIvol dan DLP Pada Pemeriksaan MSCT Kepala Dewasa Dengan Klinis Suspect Snh (Stroke Non-Hemorrhagic) Di Instalasi Radiologi Rsu Prima Medika Denpasar.
Eka Juliantara, I Putu, Pratista, Made Sayang, Nuriawan, I Made Sutha   +2 more
exaly   +2 more sources

Relationship between radiographic techniques (kilovolt and milliampere-second) and CTDIVOL

Radiation Protection Dosimetry, 2010
To investigate the relationship between radiographic techniques (i.e. kilovolt and milliampere-second) and the corresponding volume computed tomography dose index (CTDI(vol)). Data were obtained for CTDI(vol) for head and body phantoms from the ImPACT CT patient dosimetry calculator for 43 scanners from four major vendors of medical imaging equipment ...
Saeed, Elojeimy, Sameer, Tipnis, Walter, Huda   +2 more
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[Relative Error between Organ Doses and Size-specific Dose Estimates for a Specific Location When the Mean CTDIvol Value Is Used for Calculation].

Nihon Hoshasen Gijutsu Gakkai zasshi, 2023
Size-specific dose estimates (SSDEs) are dose indices that account for differences in body shape in computed tomography (CT) scans, allowing the evaluation of approximate absorbed doses in any cross section that could not be obtained with the volume CT dose index (CTDIvol).
Yutaka, Dendo, Keisuke, Abe, Shu, Onodera, Shingo, Kayano   +3 more
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TH-E-211-01: The Ability of CTDIvol to Estimate Organ Doses from Typical Tube Current Modulated Abdomen/Pelvis CT Scans

Medical Physics, 2011
Purpose: When tube current modulation (TCM) scanning is performed over multiple anatomic regions (e.g. abdomen/pelvis), typically only the average CTDIvol over all regions is reported. The purpose of this work was to compare simulated organ doses from tube current modulated scans with different CTDIvol values (including a region specific CTDIvol) and ...
M Khatonabadi, A Turner, D Zhang, J DeMarco, C Cagnon, M McNitt-Gray   +5 more
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