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KMID : 1001220130150020045
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Journal of the Korean Society of Digital Medical Imaging Technology
2013 Volume.15 No. 2 p.45 ~ p.53
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Research For Reducing Patient Dose that Low Extremity CT Angiography Using Automatic Current Selection
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An Hyeong-Theck
Kim Jae-Yeol
Yeo Woon-Sik
Park Yong-Sung
Lee Gui-Won
Lee Jong-Woong
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Abstract
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Purpose : Fixed way of mAs previously Low Extremity Computed Tomography Angiography(LECTA) examination were used. Automatic Current Selection(ACS) to use for the purpose of reducing the dose when Low Extremity Computed Tomography Angiography examining patients.
Materials and methods : Were analyzed from July 2011 to July 2012 MDCT examination of Dose Length Product(DLP) LECTA 116 Case. It was defined as previous inspection methods(Old protocol). CT workstation is set to 100 mAs and 150 mAs protocol based on the patient’s weight 70kg examined by LECTA. We defined as ’New protocol’ that applies to ACS. The data collection period are 76 cases from October 2012 to January 2013
Results : 1. Average Total DLP of ’ Old protocol’ is 3602.943 mGy*cm. 2. Average Total DLP of ’ New protocol’ is 1762.977 mGy*cm. 3. Due to the ’New Protocol’ use of Total DLP was reduced by approximately 51 %. Phase-specific dose reduction is as follows. Pre(33.62 %), Artery(64.63 %), Delay(49.0 %) 4. Using One way ANOVA Analysis of fluctuations obtained DLP is as follows. ‘Old protocol’, ’New protocol’ a value of P <0.001, P = 0.882 values were obtained.
Conclusions : Dose reduction of 51 % is a useful study that proves. The results obtained using the ACS, the effects of a dose reduction of 51 % was obtained. Therefore, it has been proven to be a useful way. Statistics using SPSS version came out of the ’Old protocol’ P-value P <0.0001. This result means that the DLP a large difference values. On the other hand, The results of the ’New protocol’ was P = 0.882. These results means to that small and regularly was fluctuations of the dose. The use of ACS, you can get a reduction of the dose and will able to get the effect of reducing the dose errors.
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KEYWORD
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Low Extremity CT Angiography, Automatic Current Selection, Dose Length Product
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