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KMID : 1131320150170010017
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Journal of Korean Society of Computed Tomographic Technology
2015 Volume.17 No. 1 p.17 ~ p.24
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Comparison to DLP of Abdomen CT according to SPR acquired when using Auto Exposure control at Chest-Abdomen scan
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Kim Jin-Hee
Lee Jong-Min
Chung Yong-Hwan
Dae Chang-Min
Min Kwan-Hong
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Abstract
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acquired SPR separately each of the chest and abdomen and when acquired SPR in chest-abdomen once in Multi-scan of Chest and Abdominal CT Scan.
Materials and method : In phantom study, Whole body phantom (KUPBU -50 Kyoto kakaku Co,LTd) was used and CT scanners Brilliance iCT(Philips healthcare, Cleveland, OH, USA), Light Speed VCT(General Electric Medical System, Milwaukee, USA), Somatom Definition Flash(Siemens Healthcare, Forchheim Germany) and Aquilion 64 (Toshiba medical system, Auklet Japan) were used. Each of manufacture, we compared the DLP and compared the value of SPR when scanning chest and abdomen once(W-SPR) with scanning Chest and Abdomen separately (S-SPR). In Clinical study, 100 patients who visited the hospital May-June 2014 were classified into Group 1. And Scanned Abdomen using with W-SPR. 100 patients who visited July-August 2014 were classified as Group 2. And Scanned using the S-SPR. Using a Box-and- Whisker plot Chart, obtained the median value of differences between Gruop 1, 2 and DLP changes.
Result : In phantom study, Philips result is 367.1 mGyㆍcm in DLP using a W-SPR and 398.1 mGyㆍcm in DLP of abdomen CT using a S-SPR. Otherwise, Siemens, GE, and Toshiba results are no difference between the DLP of abdomen CT using a W-SPR and S-SPR. In clinical study, the median DLP value percentage change was 10.42% decreased in Group 1. Median DLP values were 442.7mGyㆍcm in group 1 and 494.2mGyㆍcm in Group 2.
Conclusion : According to the results, we once more confirm, each vendor’s AEC system applies different mechanism and characteristic. Especially, P vendor’s AEC system is influenced by SPR length, sensitively. Therefore, we recommend scanning chest and abdomen at once regarding the dose reduction for P machine users.
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KEYWORD
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Scan Projection radiography, AEC, Multi-Scan, MDCT, DLP
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