多層螺旋CT 計(jì)算心室容積的準(zhǔn)確性及
最佳層厚選擇
崔煒 Takeshi Kondo Hirofumi Anno 郭玉印 Takahisa Sato Masayoshi Sarai
Hitoshi Shinozaki Satoshi Kakizawa Atsushi Sugiura Keita Oshima
Kazuhiro Katada Hitoshi Hishida
【摘要】 目的 ( 1) 確定Simpson 方法計(jì)算心室容積的最佳層厚; ( 2) 評(píng)價(jià)多層螺旋CT 計(jì)算心
室容積的準(zhǔn)確性。方法 采用多層螺旋CT( 東芝Aquilion) 掃描系統(tǒng)對(duì)14 個(gè)人的左室鑄型和15 個(gè)右
室鑄型進(jìn)行掃描。分別以2. 0、3. 5、5. 0、7. 0 及10. 0 mm 層厚重建左、右心室短軸多平面重組
( multiplanar reformatted image, MPR) 圖像。采用標(biāo)準(zhǔn)Simpson 法計(jì)算左、右心室鑄型的容積。心室鑄
型的實(shí)際容積通過(guò)鑄型排除水的容量來(lái)計(jì)算。結(jié)果 各層厚計(jì)算的心室容積均高估相應(yīng)心室的實(shí)際
容積[ 左心室高估值介于( 3. 21 ±5. 95) ml 至( 12. 58 ±8. 56) ml 之間, 右心室高估值介于( 10. 22 ±
8. 45) ml 至( 23. 91 ±12. 24) ml 之間] 。各層厚計(jì)算的心室容積均與相應(yīng)的實(shí)際心室容積高度相關(guān)
( 左心室r 值均> 0. 97, 右心室r 值均> 0. 95) ; 心室容積的高估程度與選擇的層厚呈顯著正相關(guān)( 左
心室r = 0. 998, 右心室r = 0. 996) 。當(dāng)層厚降至5 mm 時(shí), 計(jì)算的心室容積對(duì)實(shí)際容積的高估值與
2 mm層厚相比不再差異有統(tǒng)計(jì)學(xué)意義。結(jié)論 采用多排Simpson 法計(jì)算左、右心室容積時(shí), 5 mm 層
厚是最有效率的層厚。MSCT 可以準(zhǔn)確計(jì)算左、右心室容積。
【關(guān)鍵詞】 體層攝影術(shù), X 線計(jì)算機(jī); 心臟容量; 血液動(dòng)力學(xué)
The accur acy of ventr icular volume measur ement and the opt ima l slice thickness by using mult islice
helica l computed tomogr aphy CUI Wei* , Takeshi Kondo, Hirofumi Anno, GUO Yu-yin, Takahisa
Sato, Masayoshi Sa rai, Hitoshi Shinozaki, Satoshi Kakizawa, Atsushi Sugiura , Keita Oshima, Kazuhiro
Katada , Hitoshi Hishida. * Depa rtment of Ca rdiology, The Second Hospital of Hebei Medical University,
Shijia zhua ng 050000, China
【Abstra ct 】 Object ive To determine the optimal slice thickness for ventricular volume measurement
by tomographic multislice Simpson′s method and to evaluate the accuracy of ventricular volume measured by
multislice helical computed tomography ( MSCT) in human ventricular casts. Methods Fourteen human
left ventricular ( LV) and 15 right ventricular ( RV) casts were scanned with MSCT scanner by using a
scanning protocol similar to clinical practice. A series of LV and RV short-axis images were reconstructed
with slice thickness of 2 mm, 3. 5 mm, 5 mm, 7 mm, and 10 mm, respectively. Multislice Simpson′s
method was used to calculate LV and RV volumes and true cast volume was determined by water
displacement. Result s The true LV and RV volumes were ( 55. 57 ±28. 91) ml, and ( 64. 23 ±24. 51 )
ml, respectively. The calculated volumes from different slice thickness ranged from ( 58. 78 ±28. 93) ml to
( 68. 15 ±32. 57 ) ml for LV casts, and ( 74. 45 ±27. 81 ) ml to ( 88. 14 ±32. 91) ml for RV casts,
respectively. Both the calculated LV and RV volumes correlated closely with the corresponding true volumes
( all r > 0. 95, P < 0. 001) , but overestimated the corresponding true volume by ( 3. 21 ±5. 95) to ( 12. 58 ±
8. 56) ml for LV and ( 10. 22 ±8. 45) to ( 23. 91 ±12. 24) ml for RV ( all P < 0. 01) . There was a close
correlation between the overestimation and the selected slice thickness for both LV and RV volume
measurements ( r = 0. 998 and 0. 996, P < 0. 001) . However, when slice thickness was reduced to 5. 0 mm,
the overestimation became nonsignificant for slice thickness through 2. 0 mm to 5. 0 mm, and also for both
LV and RV volume measurements . Conclusion Both LV and RV volumes can be accurately calculated with
MSCT. A 5 mm slice thickness is enough and most efficient for accurate measurement of LV and RV
volume.
【Key wor ds】 Tomography, X-ray computed; Cardiac volume; Hemodynamics

多層螺旋CT 計(jì)算心室容積的準(zhǔn)確性及--心血管.rar