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KMID : 1149020180200010059
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Journal of Korean Society of Computed Tomographic Technology
2018 Volume.20 No. 1 p.59 ~ p.66
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The research about how much cradle angle effect on the dose of subject and image quality in the case of extremity CT
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Park Byeong-Seo
Lee Min-Su
Yoo Hoi-Seong
Lee Sung-Hyeon
Jeong Woo-Joon
Joo Myeong-Sik
Jo In-Wan
Park Tae-Hyeon
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Abstract
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Purpose : Correct positioning patients is the important factor for diagnosis and direction of treatment. Despite of technicians' effort, it is difficult because of patients' build and extremity, splint, and gips. In this study, we try to compare and analyze the effect of cradle angle on the dose and image quality in the case that the subject is correct with the center of cradle and the opposite case that subject get tilted by angle of cradle.
Material and method : The phantoms used in the study were acryl phantom sized 32 cm, called body phantom and the anthropomorpic phantom (RS-114T, RS-116T Radiology Support Devices, Alderson, USA). We compared the dose and the image quality using the value measured in the three cases that the center of cradle was correct with phantom, 10 cm far to the left, and 10 cm far to the right. All evaluation of the dose was done using Kruskal-Wallis test to evaluate the significance. In case of Acryl phantom, the index of coincidence was evaluated by Intra calss correlation, ICC
Result : As a result, each surface dose in the direction of 3 o'clock and 9 o'clock was 2.9±0.5 and 2.7±0.1 compared to the depth dose, 1.8±0.1 at the center. Using Kruskal-Wallis test, we found out there was significant result at the center and in 3 o'clock and 9 o'clock (0.001
Conclusion : In this study, it didn't matter in the dose and image quality even though the subject moved to the left or right in case of Extremity CT, but the distortion of image happened and the reproducibility of the shape got wores by the CT cradle tilted. That is the reason why the algorithm is applied using software to compensate for that. Also the appropriate instrument need to be used to raise the reproducibility of image.
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KEYWORD
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Extremity CT, cradle, distortion
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