2026-11-092026-11-09https://scholars.csmu.edu.tw/handle/123456789/38566Computed tomography (CT) is an extremely valuable diagnostic tool. Recent advances, particularly multidetector technology, have provided increased and more diverse applications. However, there is also the potential for inappropriate use and unnecessary radiation dose. Because some data indicate that low-dose radiation (such as that in CT) may have a significant risk of cancer, real-time dose modulations were invented to reduce patient doses. These methods were based on modulating dose by conformal body shape (x-y plane), z-direction, or combined those two, to be as low as reasonably achievable. However, the influence of dose modulation on image quality and diagnostic acceptability is worth to study. This proposal is to evaluate the influence of dose modulation on image quality and diagnostic acceptability. This project includes four parts: (1) to evaluate the dose reduction by 40-slice computed tomography with real-time on-line dose modulation; (2) to assess the correlations between modulation methods and body shapes and weight; (3) to analyze the image quality and diagnostic acceptability, including noise level, artifact, low-visibility and high-visibility contrast; (4) to estimate real-time radiation dose and objective image quality with home-made phantoms comprised three modules.電腦斷層掃瞄是極為有價值的診斷工具。最近發展出多切片掃瞄技術，提供 了更多樣化的檢查應用。然而，快速簡便的掃瞄方式，可能導致臨床上過度使用 電腦斷層掃瞄以獲得診斷資訊，並且使受檢者接受不必要的輻射，因此目前的多 切片電腦斷層掃瞄發產數種即時劑量調控的方法，包含順身體形狀 (x-y 面) 的 劑量調控、順解剖結構 (Z-軸) 的劑量調控、或兩者並用(x-y-z)的劑量調控，以 達成合理抑低受檢者的輻射劑量，然而調控劑量後，其對影像品質或診斷接受率 的影響仍有待研究，因此本研究的目的即在瞭解即時劑量調控的方法對影像品質 或診斷接受率的影響。 本研究內容包含下列四個部份：(1)探討40 切電腦斷層掃瞄之即時劑量調控 的方法如何抑低受檢者劑量與可抑低至何種程度；(2) 探討即時劑量調控的方法 與受檢者的體型與體重之相關性；(3)分析評估即時劑量調控的方法如何影像品 質，包含評比雜訊程度、影像假影、影像對比與解析度，並探討對受檢者體內之 高對比解析與低對比解析的解剖構造之診斷接受率；(4) 自製鑲入三種影像評估 組件的橢圓型與錐形假體，在各種劑量調控技術下，量測即時劑量變化以及客觀 影像品質。自動管電流調控影像品質劑量降低劑量調控診斷接受率Automatic tube current modulation (ATCM)image qualitydosereductiondose modulationdiagnostic acceptabilityProject