Experimental validation of the accuracy of reported dose-length product values in different CT scanner models
10.13491/j.issn.1004-714X.2025.02.002
- VernacularTitle:不同机型CT机 DLP报告值准确性的实验验证
- Author:
Bin YANG
1
,
2
;
Shicai ZHANG
1
,
2
;
Xiankai HUO
1
,
2
;
Zhenhe LIU
1
,
2
;
Pengcheng WANG
3
Author Information
1. Department of Radiology, Qilu Hospital of Shandong University Dezhou Hospital, Dezhou 253000 China
2. Dezhou Key Laboratory of Intelligent Imaging, Shandong, Dezhou 253000 China.
3. Shandong First Medical University (Shandong Academy of Medical Sciences), Jinan 250117 China.
- Publication Type:OriginalArticles
- Keywords:
CT;
Radiation dose;
DLP;
CTDI;
Phantom;
Pencil-type ionization chamber
- From:
Chinese Journal of Radiological Health
2025;34(2):155-160
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the accuracy of dose-length product (DLP) values in CT dose reports by comparing them with the DLP values measured using a pencil-type ionization chamber. Methods Experiments were conducted using four CT scanners with different detector row numbers from two manufacturers (A and B), along with a head phantom and a pencil-type ionization chamber. Other scanning parameters were fixed, while pairwise combinations of kV and mAs were tested. The DLP values were measured under various scanning conditions using the pencil-type ionization chamber (DLPmeasured) and the corresponding DLP values in CT dose reports were recorded (DLPreported). All data were subjected to statistical analysis. Results Differences were observed between DLPreported and DLPmeasured values. The smallest mean absolute value of ΔDLP was approximately 2.526 mGy·cm observed on the 40-row CT scanner of manufacturer A. There was a difference between the ΔDLPs of the four CT scanners. Both DLPreported and DLPmeasured exhibited a linear relationship with mAs. Conclusion The percentage errors between DLPreported and DLPmeasured values for all four CT scanners were within the national standard tolerance of 15%. DLP values in CT dose reports can serve as a reference for assessing patient radiation dose during scanning. However, for radiation dose-related research, data measured using dosimetric instruments such as pencil-type ionization chamber are recommended.
