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AIP Conference Proceedings, 2004 This paper presents the results obtained for thorax studies of both computed axial tomography (CT) and helical tomography (HT) in Mexico using home‐made LiF:Mg,Cu,P+PTFE thermoluminescent dosimeters. Results show that, using similar conditions of irradiation and slice (pitch = 1), do not exist significant differences between the absorbed dose in the ...
Azorin, J. C., Azorin, J., Calderon, A.
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An Innovative Instrumentation System for Measuring the Computed Tomography Dose Index
2009 IEEE Nuclear Science Symposium Conference Record (NSS/MIC), 2009This paper presents results from a semiconductor-based detector system to be used as an alternative for measuring the computed tomography dose index (CTDI) which is the dose descriptor in CT dosimetry. The 100 mm long ionization chamber is the device normally used, however some works have already indicated that small devices could replace the long ion ...
Divanizia N Souza, Luiz A. Santos
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Influence of Phantom Diameter, kVp and Scan Mode Upon Computed Tomography Dose Index
Medical Physics, 2003The computed tomography (CT) radiation dose to pediatric patients has received considerable attention recently. Moreover, it is important to be able to determine CT radiation doses for various patient sizes ranging from infants to large adults. The current AAPM protocol only measures CT radiation dose using a 16 cm acrylic phantom to represent an adult
Zheng F Lu, Edward L Nickoloff
exaly +3 more sources
Biomedical Physics & Engineering Express, 2022
Abstract The purpose of this study was to evaluate the performance of solid-state sensor based computed tomography dose profiler (CTDP) probe for measurement of standard computed tomography dose metric CTDI 100 and free in air geometric efficiency for various beam widths ...
Philomina Akhilesh +2 more
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Abstract The purpose of this study was to evaluate the performance of solid-state sensor based computed tomography dose profiler (CTDP) probe for measurement of standard computed tomography dose metric CTDI 100 and free in air geometric efficiency for various beam widths ...
Philomina Akhilesh +2 more
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Alternative Methods of Obtaining the Computed Tomography Dose Index
Health Physics, 1996The most direct way of getting the value of the multiple scan average dose (MSAD) in computed tomography is to employ a pencil chamber for integration of a single scan dose profile. Because the active length of the pencil chamber is fixed, the measurement can represent the value of the MSAD from a different number of contiguous scans depending on the ...
H H, Knox, R M, Gagne
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Measurements of computed tomography dose index for clinical scans
Radiation Protection Dosimetry, 2013Dose assessment in computed tomography is nowadays based on indicators such as the weighted computed tomography dose index (CTDIw) and the volume-weighted computed tomography dose index (CTDIvol), both measured only on single-axial scans. The aim of this study is to extend the set of CT protocols suitable in CTDIvol,w evaluation and therefore to ...
D, Trevisan, D, Ravanelli, A, Valentini
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Applied Radiation and Isotopes, 2023
The aim of this study is to measure the volumetric computed tomography dose index (CTDIvol) for different tube voltages for a polyester-resin (PESR) phantom, and to compare it to values for a standard polymethyl methacrylate (PMMA) phantom. Both phantoms are head phantoms with a diameter of 16 cm.
Lintang N. Fatichah +5 more
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The aim of this study is to measure the volumetric computed tomography dose index (CTDIvol) for different tube voltages for a polyester-resin (PESR) phantom, and to compare it to values for a standard polymethyl methacrylate (PMMA) phantom. Both phantoms are head phantoms with a diameter of 16 cm.
Lintang N. Fatichah +5 more
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Database of normalised computed tomography dose index for retrospective CT dosimetry
Journal of Radiological Protection, 2014Volumetric computed tomography dose index (CTDIvol) is an important dose descriptor to reconstruct organ doses for patients combined with the organ dose calculated from computational human phantoms coupled with Monte Carlo transport techniques. CTDIvol can be derived from weighted CTDI (CTDIw) normalised to the tube current-time product (mGy/100 mAs ...
Eunah, Lee +3 more
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Health Physics, 2010
To address the lack of accurate dose estimation method in cone beam computed tomography (CBCT), we performed point dose metal oxide semiconductor field-effect transistor (MOSFET) measurements and Monte Carlo (MC) simulations. A Varian On-Board Imager (OBI) was employed to measure point doses in the polymethyl methacrylate (PMMA) CT phantoms with ...
Sangroh, Kim +5 more
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To address the lack of accurate dose estimation method in cone beam computed tomography (CBCT), we performed point dose metal oxide semiconductor field-effect transistor (MOSFET) measurements and Monte Carlo (MC) simulations. A Varian On-Board Imager (OBI) was employed to measure point doses in the polymethyl methacrylate (PMMA) CT phantoms with ...
Sangroh, Kim +5 more
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The ACR Computed Tomography Dose Index Registry: The 5 Million Examination Update
Journal of the American College of Radiology, 2013The ACR opened the Computed Tomography Dose Index Registry (DIR) for general participation by all facilities in May 2011. Just over 2 years after its launch, the registry has more than 750 registered facilities, 465 of which were actively contributing data at the end of August 2013. The registry has dose index information on 5.5 million CT examinations,
Mythreyi, Bhargavan-Chatfield +1 more
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