DSA 測(cè)量技術(shù)誤差與控制
高宗恩 任曉萍 杭鵬 張先軍
【摘要】 目的 探討DSA 測(cè)量技術(shù)誤差的產(chǎn)生與控制。方法 在GE 公司生產(chǎn)的LCV Plus
DSA 機(jī)上測(cè)得數(shù)據(jù)。將顯示屏分為中央?yún)^(qū)、中間區(qū)及邊遠(yuǎn)區(qū)3 個(gè)區(qū)帶, 對(duì)不同大小定標(biāo)在不同檢查床
高度及不同點(diǎn)光源與增強(qiáng)器高度( SID) 條件下, 測(cè)量標(biāo)的( 人民幣5 角硬幣) 的放大、縮小情況。結(jié)果
隨著標(biāo)的外移, 由中央?yún)^(qū)到邊遠(yuǎn)區(qū)標(biāo)的逐漸放大, 且縱向放大比橫向放大顯著。不同的定標(biāo)對(duì)比,
硬幣( 直徑20. 4 mm) 和鋼球( 直徑7. 7 mm) 測(cè)量相同標(biāo)的結(jié)果相差較小, 而導(dǎo)管( 4F) 定標(biāo)有顯著的
低估實(shí)物傾向。同區(qū)帶同軸向測(cè)量, 測(cè)量誤差控制在1. 0% ～- 2. 5% 之間。結(jié)論 將顯示屏劃分為
中央?yún)^(qū)、中間區(qū)及邊遠(yuǎn)區(qū)將有助于介入醫(yī)師對(duì)測(cè)量誤差的控制。以定標(biāo)物的橫向做定標(biāo)來(lái)測(cè)量標(biāo)的
較為準(zhǔn)確, 同區(qū)帶同軸向測(cè)量誤差控制較好。
【關(guān)鍵詞】 血管造影術(shù), 數(shù)字減影; 放射測(cè)量術(shù); 圖像處理, 計(jì)算機(jī)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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