Volume 57, Number 4, October - December 2022
|Page(s)||311 - 318|
|Published online||14 September 2022|
The role of topogram views on dose indices and image quality in thorax and abdomen-pelvis CT scan
1 Student Research Committee, Babol University of Medical Sciences, Babol, Iran
2 Cancer Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran
3 Department of Medical Physics, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran
4 Department of Medical Physics Radiobiology and Radiation Protection, School of Medicine, Babol University of Medical Sciences, Babol, Iran
5 Department of Radiology and Radiotherapy, School of Medicine, Babol University of Medical Sciences, Babol, Iran
* Corresponding author: email@example.com
Accepted: 31 July 2022
This study was designed to investigate the effect of the different topograms (AP and dual AP/Lateral) on patient dose indices and image quality in thorax and abdomen-pelvis CT. Size-specific dose estimation (SSDE), volumetric CT dose index (CTDIvol), milliampere seconds (mAs), effective dose, as well as signal to noise ratio (SNR) and contrast to noise ratio (CNR) of 60 thorax and 60 abdomen-pelvis CT scans were analyzed. In thorax CT, SSDE, mAs, CTDIvol and effective dose were significantly reduced by using dual topograms (p < 0.05) but not significantly reduced in abdominal-pelvic scans (p > 0.05). There was no significant difference between CNR parameter in the two groups for thorax CT (p > 0.05) and SNR parameter in abdomen-pelvic CT (p < 0.05) and all images were diagnostically acceptable. The use of two topograms in thorax CT is an efficient approach to reduce dose indices without decreasing the image quality.
Key words: computed tomography / topogram / dose index / image quality
© SFRP, 2022
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