DSA 測量技術誤差與控制
高宗恩 任曉萍 杭鵬 張先軍
【摘要】 目的 探討DSA 測量技術誤差的產生與控制。方法 在GE 公司生產的LCV Plus
DSA 機上測得數據。將顯示屏分為中央區、中間區及邊遠區3 個區帶, 對不同大小定標在不同檢查床
高度及不同點光源與增強器高度( SID) 條件下, 測量標的( 人民幣5 角硬幣) 的放大、縮小情況。結果
隨著標的外移, 由中央區到邊遠區標的逐漸放大, 且縱向放大比橫向放大顯著。不同的定標對比,
硬幣( 直徑20. 4 mm) 和鋼球( 直徑7. 7 mm) 測量相同標的結果相差較小, 而導管( 4F) 定標有顯著的
低估實物傾向。同區帶同軸向測量, 測量誤差控制在1. 0% ～- 2. 5% 之間。結論 將顯示屏劃分為
中央區、中間區及邊遠區將有助于介入醫師對測量誤差的控制。以定標物的橫向做定標來測量標的
較為準確, 同區帶同軸向測量誤差控制較好。
【關鍵詞】 血管造影術, 數字減影; 放射測量術; 圖像處理, 計算機輔助
Assessment of the err or of measur ement t echnique on DSA GAO Zong-en, REN Xiao-ping, HANG
Peng, ZHANG Xian-jun. Imaging center, Shengli Oilfield Central Hospital, Dongying 257034, China
【Abstr act】 Objective To explore the creation and control of measurement technique error on digital
substation angiography ( DSA) . Methods The data was obtained from Advantx LCV Plus DSA system
made by GE Corporation. We divided the screen into three areas, per area account for 1 / 3, ie, central area,
middle area and outlying area. The enlargement rate or reduction rate of the target object was respectively
calculated according to the different calibration, different height of the bed and different X-ray source to
image distance ( SID) . Results The target object was enlarged gradually from the central area to the
outlying area, and the lengthwise enlargement rate was more obvious than transverse. The different of target
object measured by coin ( diameter was 20. 4 mm) with steel ball ( diameter was 7. 7 mm) was not
significance, but the target object was underestimated significantly used the calibration by 4F catheter. When
the target object was measured by the calibration in same area and same axis, the error of measurement
technique was controlled rang from 1. 0% to -2. 5%. Conclusion This systematic investigation suggest that
the screen was divided into the central area, middle area and outlying area will be beneficial to control DSA
measurement error for the interventional physician. The target object was close to real size when it measured
by transverse of the calibration, and the error was better controlled when the calibration was in the same area
and same axis as the target object.
【Key wor ds】 Angiography, digital subtraction; Radiometry; Image processing, computer-assisted

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