Abstract

Info

Title:: Using disposable film to measure the dose profiles in axial scanning and helical scanning with computed tomography

Author(s):: DAI Xing1; XU Jiali2; LIANG Baohui1; 1. School of Medical Imaging, Benbu Medical College, Bengbu 233000, China; 2. Department of Radiology, the First Affiliated Hospital of Bengbu Medical College, Bengbu 233004, China

Keywords:: ; Keywords: computed tomography; disposable film; axial scanning; helical scanning

Abstract:: Abstract: Objective To measure the dose profiles in axial scanning and helical scanning with computed tomography (CT), and investigate the related influence factors. Methods Gafchromic disposable film was used to measure the dose profile of GE LightSpeed 64 CT scanner. After being exposed by CT scanner, the disposable film was scanned with HP scanjet 7400c to obtain digital image, and then ImageJ software was applied to process the digital image for obtaining the dose profile. Results In axial scanning mode, the deviation between full width at half-maximum and nominal beam collimation width was within 4 mm, and moreover, the effects of field of view and types of filters on the dose profile in axial scanning were ignorable. In helical scanning mode, the overranging was mainly dependent on beam collimation width, and moreover, pitch, reconstruction slice thickness and field of view had trivial effects on overranging. Conclusion Disposable film is capable of rapidly measuring the dose profiles in axial scanning and helical scanning with CT.