scholarly journals Estimating patient dose from CT exams that use automatic exposure control: Development and validation of methods to accurately estimate tube current values

2017 ◽  
Vol 44 (8) ◽  
pp. 4262-4275 ◽  
Author(s):  
Kyle McMillan ◽  
Maryam Bostani ◽  
Christopher H. Cagnon ◽  
Lifeng Yu ◽  
Shuai Leng ◽  
...  
Keyword(s):  
Patient Dose ◽  
Exposure Control ◽  
Automatic Exposure Control ◽  
Validation Of Methods ◽  
Tube Current ◽  
Development And Validation

ESTIMATION OF RADIATION DOSE IN CT VENOGRAPHY OF THE LOWER EXTREMITIES: PHANTOM EXPERIMENTS USING DIFFERENT AUTOMATIC EXPOSURE CONTROL SETTINGS AND SCAN RANGES

2019 ◽  
Vol 188 (1) ◽  
pp. 109-116
Author(s):  
Yusuke Inoue ◽  
Hiroyasu Itoh ◽  
Kazunori Nagahara ◽  
Yuka Takahashi
Keyword(s):  
Radiation Dose ◽  
Effective Dose ◽  
Lower Extremities ◽  
Whole Body ◽  
Exposure Control ◽  
Automatic Exposure Control ◽  
Dose Length Product ◽  
Ct Venography ◽  
Tube Current ◽  
Phantom Experiments

Abstract We performed phantom experiments to assess radiation dose in computed tomography (CT) venography of the lower extremities. CT images of a whole-body phantom were acquired using different automatic exposure control settings and scan ranges, simulating CT venography. Tube current decreased in the lower extremities compared to the trunk. The scout direction and dose modulation strength affected tube current, dose length product (DLP) and effective dose. The middle and distal portions of the lower extremities contributed substantially to DLP but not to effective dose. When effective dose was estimated by multiplying DLP by a single conversion factor, overestimation was evident; this became more pronounced as the scan range narrowed. In CT venography of the lower extremities, the scout direction and modulation strength affect radiation dose. Use of DLP severely overestimates radiation dose and underestimates effects of scan range narrowing.

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