|
KMID : 1131320150170010073
|
|
Journal of Korean Society of Computed Tomographic Technology
2015 Volume.17 No. 1 p.73 ~ p.81
|
|
|
Evaluation of angiography scans using the high pitch chestpain cardiac scan mode from Dual source CT
|
|
Lee Dae-Kyu
Lee Min-Yung
Chang Kwang-Hyun
|
|
|
Abstract
|
|
|
Purpose : Using chest pain flash mode of 128 channel dual source computed tomography (below DSCT), we studied and tested one scanning CT protocol with less than 1 second scan time for intra cranial, carotid, and coronary vessel, then examined coronary angiography with helical scan mode, comparing the images that intra and carotid after injecting additional contrast media, following that purposed the dose reduction and usefulness.
Materials & Methods: In this phantom test, Somatom Definition Flash (Siemens Healthcare, Forchheim, Germany)CT equipment for two 128-channel detector and Alderson Rando phantom(CNMC Company, USA) was used for the organ dose evaluation. For dose evaluation, Dose Ace (GD-351, 12 mm, FGD-1000 reader, Asahi Techno Glass Cooperation, Shizuoka, Japan) which is fluorescent glass dosimeter was used. Also, organ dose were measured by glass dosimeters positioning each two on head, neck, lungs and heart, belonging to the main flux. The clinical condition tested by high pitch scan mode with 104 patients whose heart rate was under 60 and tested by helical scan mode with 106 patients targeting 210 patients having CCTA from March 2014 to August 2014.
Phantom studies using the same equipment and inspection were divided in the same condition, and the double-contrast injector (dual flow injector, Stellant, Medrad, Inc, USA) for enhancement was used. In the way each evaluated, was compared by measuring the head, neck and heart CNR, SNR, and evaluated two reading heart specialist of Radiology, separated by step of 4 images.
Statistical analysis for the subjective assessment was used to Mann-Whiteny test of Graphpad Instat ver 3.05 and statistically significant was less than 0.05. CTDIvol, DLP and effective dose were evaluated to dose evaluation, for statistical analysis, normality test was used through equal variance examination, T- test were for analysis, and statistical significance level was done less than 0.05.
Results:
1. Phantom dose evaluation: the effective dose of High pitch scan mode decreased about 35.7% (p <0.05) comparing to standard pitch scan mode & helical scan mode.
2. Clinical study dose evaluation: the effective dose value tested high pitch mode with one scan from head to coronary decreased about 30% (p <0.05) which done two scan by standard pitch and helical scan.
3. Clinical image evaluation: Both were significant differences in the two test mode for qualitative and quantitative evaluation value (p <0.05).
Conclusion : If Scanning chest pain Flash scan mode for patients whose heart rate is below 60, it is possible that direct one scanning intra cranial, carotid, and coronary angiography exams with less than 2.5 mSv and image quality is equal. So it could be considered to diagnosis for health care and heart- brain vessel disease patients usefully.
|
|
|
KEYWORD
|
|
|
Chest pain Flash scan mode, standard pitch scan mode & helical scan mode, effective dose
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|
|