頁籤選單縮合
題名 | 正子射出斷層掃描儀之散射分析及修正=Scattering Analysis and Correction for Positron Emission Tomography |
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作者 | 楊建海; 鍾炳濤; 詹美齡; 林康平; | 書刊名 | 中原學報 |
卷期 | 28:1 2000.03[民89.03] |
頁次 | 頁11-19 |
分類號 | 414.93 |
關鍵詞 | 三維正子射出數據重分箱; 散射核心分佈函數; 疊代式旋積相減法; 3D PET data rebinning; Scatter kernel distribution function; Iterative convolution subtraction; |
語文 | 中文(Chinese) |
中文摘要 | 在核子醫學正子射出斷層掃描系統所擷取的三維投射事件中,對各種偵測數據作 定量分析時,由於此三維模式的數據擷取會使散射率增加,而散射率的增加又對系統所獲得 的影像解析度、對比及絕對或相對量化分析等產生負面影響。所以如何降低散射事件,提高 系統解析度,是三維正子射出斷層掃描儀的重要課題。本文針對三維投射的原理,以線狀射 源於水中的散射模式,模擬射源物在組織中的三維投射數據,經由軸向數據重分箱後,重組 橫軸向獨立切面之二維投射數據。再利用二次多項式曲線揉和法,使各獨立切面之散射數據 ,分別以曲線揉和後之散射核心分佈函數表示。並藉由橫軸向切面獨立處理的方式化簡三維 旋積,以疊代式旋積相減法對散射部份進行修正,達到消除三維正子射出斷層掃描系統之散 射修正的目的。經由不同強度,不同形狀及不同位置的射源物散射修正測試,比較修正前後 散射事件分佈,平均散射修正率為 78 %,印證本法確能有效消除大部份散射事件,達到提 升偵測效率的目的。 |
英文摘要 | On positron emission tomographic (PET) imaging, the 3D coincident events will increase the sensitivity of signal detection. However, the increase of the sensitivity is accompanied with many scattering events which reduce the accuracy of PET image contrast, resolution and both relative and absolute quantitative values. Therefore, scattering correction is important in PET quantitative analysis and its applications. In this paper, the scattering events in the 3D PET sinograms were corrected based on estimating the scattering kernel functions for each 2D rebinned plane with iterative convolution subtraction method. The scattering kernel distribution function was determined from the second order polynomial fitting on the two sides of log plots of the sinograms. Each kernel distribution functions is z-axis dependent. The 3D simulated data including primary and scattered coincident events were obtained using PGH program, a standard 3D PET simulation software. Results show that ∼ 78% scattered events can be effectively eliminated. The presented scattering correction method not only keeps the sensitive manner in original 3D PET data, but can be simply implemented in any existing system. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。