自動化電腦斷層影像品質分析

Automatic Computed Tomography Image Quality Assurance Analysis

電腦斷層掃描儀廣泛用於非侵入性檢查中。為了確保斷層掃描的影像品質，必需要依賴特殊設備所產生的檢測影像，然後透過影像量測及目視方式進行判斷。 有幾項關鍵性參數攸關影像品質的好與壞； 包括影像明暗對比（Contrast scale）、高對比空間解析（High Contrast Resolution）、低對比空間解析（Low contrast detectability）、 CT 值及雜訊的均勻度（Noise andUniformity）、雷射定位線的準確度（Laser Accuracy）等。 本研究希望將電腦斷層的影像品質， 透過程式進行分析、研判， 包括影像明暗對比、高對比空間解析、低對比空間解析、 CT值及雜訊的均勻度、雷射定位線的準確度以及MTF這幾個量測結果， 並且直接顯示在螢幕上， 讓工作人員不必花時間就可以了解目前影像品質的狀況。

Computed tomography(CT) scanners have been widely used in the non-invasive examination. To ensure the quality of the CT scan image, we will need to rely on the special equipment to produce the detecting image, and then carry on the judgment by the image measurements and visual way. There are several key parameters including Contrast scale, High Contrast Resolution, Low contrast detectability, Noise and Uniformity, Laser Accuracy are employed to judge whether the quality of CT image is good or bad. This study would like to obtain the CT image quality through program analysis, analyzing Contrast scale, High Contrast Resolution, Low contrast detectability, Noise and Uniformity, Laser Accuracy and Modulation Transfer Function and the results are directly displayed on the screen, so that the staff do not have to take the time to be able to understand the current status of image quality.