藉由田口方法以及自製動態水假體探討320切電腦斷層以及雙射源電腦斷層影像解析度之最佳化設定

Optimization the Toshiba Aquilion ONE CT scanner and Siemens SOMATOM Definition Flash CT scanner image resolution using dynamic water phantom and Taguchi analysis

陳道明(Dao-Ming Chen)

指導教授 ： 潘榕光

中臺科技大學/健康科學院/醫學影像暨放射科學系暨研究所/碩士(2012年)

https://doi.org/10.6822/CTUST.2012.00046

摘要

本研究藉由田口方法找尋電腦斷層掃描中各項參數設定對於影像解析度的影響以及其最佳化之參數設定。由於目前醫學影像在臨床醫學診斷上被應用得很廣泛，尤其電腦斷層更是其中非常重要的一環，其優點包含能夠在短的造影時間內可以獲得高品質的影像；因此本研究希望能藉由調整各項設定參數將影像解析度達到最佳化。本次實驗使用中山醫學大學附設醫院的Toshiba Aquilion ONE CT 掃描儀以及Siemens SOMATOM Definition Flash CT 掃描儀兩台電腦斷層進行實驗。藉由田口方法當中的L18實驗設計直交表進行，總共設定六個實驗因子，包含:kernel、mAs、kVp、pitch、slice thickness以及FOV，每個因子分別設定三個水準；並透過一個自行設計的壓克力動態水假體，可以讓電腦斷層透過掃描動態的物件的情況下達到解析度最佳化的目的，最後再利用ANOVA進行分析。結果在Siemens雙射源CT的參數設定當中kVp、pitch以及FOV為其主要調整因子，最佳化設定為B40f的kernel、210 mAs、140 kVp、1 pitch、slice thickness為7 mm以及FOV為250 mm；在Toshiba Aquilion ONE CT當中則是kVp、pitch以及slice thinkness為其主要調整因子，最佳化設定為FC13的kernel、250 mAs、135 kVp、0.641 pitch、slice thickness為7 mm以及FOV為400 mm。

關鍵字

動態假體 ； 田口方法 ； 醫學影像 ； 電腦斷層 ； 直交表

並列摘要

Optimization the Toshiba Aquilion ONE CT scanner and Siemens SOMATOM Definition Flash CT scanner image resolution using dynamic water phantom and Taguchi analysis. Producing high quality images in CT is important for image interpretation and to obtain the maximum diagnostic information from the images. Hence there is a need for knowledge of image quality assessment tools in CT in order to recognise images of adequate diagnostic efficacy. These are discussed with their relevance to CT image quality optimization. This time using the 320 slices CT scanner and dual source CT scanner set at Chung Shan Medical University Hospital, and BBQ dynamic water phantom is a side length of 30 cm cube, it can be rotated in an external motors, on the right that I made a V-shaped glass capillary test tool, which includes two glass capillary, when the scanning suite will be V-shaped implant into the BBQ inside motors connected with that position. Which the parameter settings in the Siemens dual-source CT kVp, pitch, and FOV of its main domint factor, optimized settings for the B40f kernel, 210 mAs, 140 kVp, 1 pitch, the slice thickness of 7 mm and FOV 250 mm; Toshiba Aquilion ONE CT is kVp,pitch, and slices the thinkness its adjustment factor, the best settings for FC13 kernel,250 mAs, 135 kVp, 0.641 pitch, the slice thickness of 7 mm and FOV 400 mm. In this experiment, which, in accordance with the terms of the self-defined resolution and Taguchi optimization method, after the experience a whole to find out the optimization settings parameters, and finally compare two computed tomography scanners, 320 slices CT of the overall averageperformance is indeed better than the dual-radiation source CT.

並列關鍵字

Computed tomography ； Taguchi method ； Medical Imaging ； dynamic water phantom

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