scholarly journals Fetal dose conversion factor for fetal computed tomography examinations: A mathematical phantom study

2017 ◽  
Vol 18 (5) ◽  
pp. 330-335 ◽  
Author(s):  
Yuta Matsunaga ◽  
Ai Kawaguchi ◽  
Masanao Kobayashi ◽  
Shoichi Suzuki ◽  
Yasuki Asada ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Conversion Factor ◽  
Phantom Study ◽  
Dose Conversion Factor ◽  
Fetal Dose

scholarly journals Effects of Activity Size Distribution on Dose Conversion Factor for Radon Progeny.

2001 ◽  
Vol 36 (4) ◽  
pp. 329-338 ◽  
Author(s):  
Tetsuo ISHIKAWA ◽  
Shinji TOKONAMI ◽  
Hidenori YONEHARA ◽  
Kumiko FUKUTSU ◽  
Yuji YAMADA
Keyword(s):  
Size Distribution ◽  
Conversion Factor ◽  
Radon Progeny ◽  
Dose Conversion Factor

2113 DUAL SOURCE COMPUTED TOMOGRAPHY FOR DETERMINATION OF STONE COMPOSITION: A PHANTOM STUDY

2010 ◽  
Vol 183 (4S) ◽  
Author(s):  
Brian Eisner ◽  
Ali Daha ◽  
Avinash Kambadakone ◽  
Mohummad Siddiqui ◽  
Dushyant Sahani
Keyword(s):  
Computed Tomography ◽  
Phantom Study ◽  
Stone Composition ◽  
Dual Source ◽  
Dual Source Computed Tomography

scholarly journals Feasibility of Improving the Accuracy of Dose Calculation Using Hybrid Computed Tomography Images: A Phantom Study

2021 ◽  
Vol 32 (1) ◽  
pp. 18-24
Author(s):  
Hosang Jeon ◽  
Dong Woon Kim ◽  
Ji Hyeon Joo ◽  
Yongkan Ki ◽  
Wontaek Kim ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Dose Calculation ◽  
Phantom Study ◽  
Computed Tomography Images

scholarly journals Comparison of acquisition and iterative reconstruction parameters in abdominal computed tomography-guided procedures: a phantom study

2021 ◽  
Vol 0 (0) ◽  
pp. 0-0
Author(s):  
Julien Frandon ◽  
Philippe Akessoul ◽  
Aymeric Hamard ◽  
Edinaud Bezandry ◽  
Romaric Loffroy ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Iterative Reconstruction ◽  
Phantom Study ◽  
Abdominal Computed Tomography

Dose-Optimized Computed Tomography for Screening and Follow-Up of Solid Pulmonary Nodules in Obesity: A Phantom Study

2017 ◽  
Vol 46 (3) ◽  
pp. 204-209 ◽  
Author(s):  
Katharina Martini ◽  
Borna K. Barth ◽  
Kai Higashigaito ◽  
Stephan Baumueller ◽  
Hatem Alkadhi ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Pulmonary Nodules ◽  
Phantom Study

Conversion from dose-length product to effective dose in computed tomography venography of the lower extremities

2022 ◽  
Author(s):  
Yusuke Inoue ◽  
Yuka Yonekura ◽  
Kazunori Nagahara ◽  
Ayuka Uehara ◽  
Hideki Ikuma
Keyword(s):  
Computed Tomography ◽  
Effective Dose ◽  
Conversion Factor ◽  
Lower Extremities ◽  
Pulmonary Angiography ◽  
Ct Scanner ◽  
Dose Length Product ◽  
Ct Venography ◽  
Simplified Method ◽  
Imaging Conditions

Abstract For radiation dose assessement of computed tomography (CT), effective dose (ED) is often estimated by multiplying the dose-length product (DLP), provided automatically by the CT scanner, by a conversion factor. We investigated such conversion in CT venography of the lower extremities performed in conjunction with CT pulmonary angiography. The study subjects consisted of eight groups imaged using different scanners and different imaging conditions (five and three groups for the GE and Siemens scanners, respectively). Each group included 10 men and 10 women. The scan range was divided into four anatomical regions (trunk, proximal thigh, knee and distal leg), and DLP was calculated for each region (regional DLP). Regional DLP was multiplied by a conversion factor for the respective region, to convert it to ED. The sum of the ED values for the four regions was obtained as standard ED. Additionally, the sum of the four regional DLP values, an approximate of the scanner-derived DLP, was multiplied by the conversion factor for the trunk (0.015 mSv/mGy/cm), as a simplified method to obtain ED. When using the simplified method, ED was overestimated by 32.3%−70.2% and 56.5%−66.2% for the GE and Siemens scanners, respectively. The degree of overestimation was positively and closely correlated with the contribution of the middle and distal portions of the lower extremities to total radiation exposure. ED/DLP averaged within each group, corresponding to the conversion factor, was 0.0089−0.0114 and 0.0091−0.0096 mSv/mGy/cm for the GE and Siemens scanners, respectively. In CT venography of the lower extremities, ED is greatly overestimated by multiplying the scanner-derived DLP by the conversion factor for the trunk. The degree of overestimation varies widely depending on the imaging conditions. It is recommended to divide the scan range and calculate ED as a sum of regional ED values.

A PHANTOM STUDY SHOWING THE IMPORTANCE OF BREAST SHIELDING DURING HEAD CT

2020 ◽  
Vol 188 (4) ◽  
pp. 464-469 ◽  
Author(s):  
Nika Zalokar ◽  
Nejc Mekiš
Keyword(s):  
Computed Tomography ◽  
Dose Reduction ◽  
Phantom Study ◽  
Anthropomorphic Phantom ◽  
Head Ct ◽  
Lead Shield ◽  
Phantom Measurements ◽  
Lead Shielding ◽  
Head Computed Tomography

Abstract This study aimed to investigate the dose to the breasts during head computed tomography (CT) if lead shielding is used. The study was performed in two major hospitals using helical and axial protocols on an anthropomorphic phantom. Measurements were performed with and without the use of a lead shield of 0.5 mm equivalent density. The results showed a significant decrease in dose with the lead shielding in both hospitals. During the helical protocol, the use of shielding significantly reduced the dose by 96% in Hospital A and 82% in Hospital B. The dose reduction during axial protocol was also significant: 95% in Hospital A and 86% in Hospital B with lead shielding. Considering the significant dose reduction of 82% up to 96% during this study, we highly recommend the shielding of breasts regardless of the protocol used during head CT examinations.

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