Optimization of patient dose and image quality for Computed tomography examination
Fatma mostafa mohamed said.;
Abstract
There are two purpose of this survey; the first was determination of patient dose by using ionization chambers, the second is to measure the degree of accuracy image quality for each protocol. Estimation of the best protocols that can be used in diagnostic centers according to the international CT dose a limit which does not affect the image quality.
The standard head and body phantom in combination with longitudinal ionization chamber dedicated for CT dose were used to measure the computed tomography dose index (CTDI) and dose length product (DLP) for the selected protocols. The X-ray tube potential range 80,100and 120 kVp, time - current tube range 50 to 250 mAs and the scan mode utilized for the measurements is the helical scan.
Our results reveals that there is a good matching between the values of CTDIvol data obtained from the CT scanner and the measured value, within the range from 4 % to 11 %. The CTDIvol for head scan were varied from 3.1 to 35.1 mGy, from 4 to 51.9 mGy and from 5.6 mGy to 73.8 mGy at 80, 100 kVp and 120 kVp respectively at various mAs. For abdomen scan the CTDIvol were varied from 0.8
The standard head and body phantom in combination with longitudinal ionization chamber dedicated for CT dose were used to measure the computed tomography dose index (CTDI) and dose length product (DLP) for the selected protocols. The X-ray tube potential range 80,100and 120 kVp, time - current tube range 50 to 250 mAs and the scan mode utilized for the measurements is the helical scan.
Our results reveals that there is a good matching between the values of CTDIvol data obtained from the CT scanner and the measured value, within the range from 4 % to 11 %. The CTDIvol for head scan were varied from 3.1 to 35.1 mGy, from 4 to 51.9 mGy and from 5.6 mGy to 73.8 mGy at 80, 100 kVp and 120 kVp respectively at various mAs. For abdomen scan the CTDIvol were varied from 0.8
Other data
| Title | Optimization of patient dose and image quality for Computed tomography examination | Other Titles | تحقيق النتائج المثلى لجرعة المريض الاشعاعية وجودة الصوره فى الفحوصات المختلفة لجهاز الاشعة المقطعية | Authors | Fatma mostafa mohamed said. | Issue Date | 2019 |
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