Results 251 to 260 of about 5,652,430 (282)
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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
Edward L, Nickoloff +2 more
exaly +3 more sources
European Radiology, 2014
To compare hepatic parenchymal contrast media (CM) enhancement during multi-detector row computed tomography (MDCT) and its correlation with volume pitch-corrected computed tomography dose index CTDI(vol)) and body weight (BW).One hundred patients referred for standard three-phase thoraco-abdominal MDCT examination were enrolled. BW was measured in the
Anders Svensson Marcial +2 more
exaly +3 more sources
To compare hepatic parenchymal contrast media (CM) enhancement during multi-detector row computed tomography (MDCT) and its correlation with volume pitch-corrected computed tomography dose index CTDI(vol)) and body weight (BW).One hundred patients referred for standard three-phase thoraco-abdominal MDCT examination were enrolled. BW was measured in the
Anders Svensson Marcial +2 more
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
openaire +2 more sources
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
openaire +2 more sources
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
openaire +2 more sources
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
openaire +2 more sources
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
openaire +2 more sources
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
openaire +2 more sources
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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COMPUTED TOMOGRAPHY DOSE INDEX MEASUREMENT FOR Hi-ART MEGAVOLTAGE HELICAL CT
Radiation Protection Dosimetry, 2015On-line megavoltage computed tomography (MVCT) images are used to verify patient daily set-up in Hi-ART helical TomoTherapy unit. To evaluate the patient dose from MVCT scanning in image guidance, weighted computed tomography (CT) dose index (CTDIw) was measured with PTW TM30009 CT pencil chamber in head and body phantoms for slice thicknesses of 2, 4 ...
Minglu, Liu +2 more
openaire +2 more sources
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 ...
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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 ...
openaire +1 more source