Results 221 to 230 of about 6,218,792 (246)

COMPUTED TOMOGRAPHY DOSE INDEX MEASUREMENT FOR Hi-ART MEGAVOLTAGE HELICAL CT

Radiation Protection Dosimetry, 2015
On-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, Yunlai, Wang, Xiongfei, Liao   +2 more
openaire   +2 more sources

Proposal and validation of weighting factors for the weighted computed tomography dose index in dual-energy computed tomography

Journal of Radiological Protection
Abstract This study aimed to propose and validate optimal weighting factors for weighted computed tomography dose index (CTDI w ) in dual-energy computed tomography (DECT) to improve average dose estimation in the central cross-sectional plane of a CTDI phantom. CTDI
Ayaka Hirosawa, Kosuke Matsubara, Yusuke Morioka, Atsushi Fukuda   +3 more
openaire   +2 more sources

Dose Reduction by Body Mass Index: Different Protocol in low-Dose Chest Computed tomography

Indian Journal of Public Health Research & Development, 2018
We investigated the effects of exposure involving reduction of automatic exposure control value based on body mass index and image quality using the AAPM phantom in low-dose computed tomography (CT). The study was carried out on subclinical, normal persons without lung diseases among students in a single university.
Ah-Ram Cho, Jin-Woo Kim, Eun-Seong Lee, Su-Chul Han, Cheong-Hwan Lim, Hong-Ryang Jung   +5 more
openaire   +1 more source

Estimation of adaptive computed tomography dose index based on body weight in pediatric patients

Radiation Medicine, 2008
The aim of this study was to create an adaptive computed tomography dose index (by volume) (CTDI vol) for pediatric patients that would be fitted to a patient's particular body weight and to compare the adaptive CTDI vol with the CTDI vol displayed on the screen of the CT console.CT images of 60 children whose body weights were known were available for
Osamu, Miyazaki, Tetsuya, Horiuchi, Hidekazu, Masaki, Shunsuke, Nosaka, Mikiko, Miyasaka, Yoshiyuki, Tsutsumi, Yoshiyuki, Okada, Masayuki, Kitamura   +7 more
openaire   +2 more sources

Monte Carlo Simulation of the Computed Tomography Dose Index (CTDI) Using GATE

Physics of Particles and Nuclei Letters, 2020
This work relates to the study and characterization of the CTDI (Computed Tomography Dose Index) for the 16 slices CT scanner. The CTDI has been simulated with the Monte Carlo code GATE for PMMA (polymethylmethacrylate) digital phantoms of various diameters (1–50 cm) at various kVp (80, 110, 130) and mAs (100, 200, 300, 400 mAs) levels.
M. Mkimel, R. El Baydaoui, M. R. Mesradi, Z. Tahiri, K. Talasmat, A. Halimi, M. Krim, E. Saad, A. Hilali   +8 more
openaire   +1 more source

Automatic individualized contrast medium dosage during hepatic computed tomography by using computed tomography dose index volume (CTDIvol)

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, Jonas, Björk, Kerstin, Cederlund, Peter, Aspelin, Ulf, Nyman, Torkel B, Brismar   +5 more
openaire   +2 more sources

[Determination of computer tomography dose index by means of ion chamber measurements].

La Radiologia medica, 1995
The effective dose (ED) and the organ dose given with Computer Tomography (CT) scanners can be determined by means of a computing method suggested by the English National Radiological Protection Board (NRPB). This method uses the integral air-dose profile as input.
A, Piermattei, F, Cichocki, G, Rossi, L, Venga, G, Arcovito   +4 more
openaire   +1 more source

Dose Profile and Dose Index Analysis in Computed Tomography

Radiation Protection Dosimetry, 1995
A.D. Oliveira, J.G. Alves, A.F. Carvalho, J.V. Carreiro   +3 more
openaire   +1 more source

Relationships of Radiation Dose Indices With Body Size Indices in Adult Body Computed Tomography

Tomography, 2023
Yusuke Inoue, Kazunori Nagahara, Kohei Mitsui   +2 more
exaly  

Determination of Low Muscle Mass by Muscle Surface Index of the First Lumbar Vertebra Using Low-Dose Computed Tomography

Journal of Clinical Medicine, 2022
Chien-Hung Gow, Ping-Huai Wang, Yen-Ling Chiu   +2 more
exaly