Lee Jae Seok, Chung Byung Ha
Department of Urology, Urological Science Institute, Yonsei University College of Medicine, Seoul, Korea.
Urol Int. 2007;78(4):323-7. doi: 10.1159/000100836.
There are relatively few studies that compare the use of transrectal ultrasound (TRUS) to magnetic resonance imaging (MRI) to estimate the prostate volume. In this study, we compared the prostate volumes measured with MRI and TRUS with a surgical specimen volume.
Seventy-three patients underwent TRUS examination of the prostate prior to radical prostatectomy. All specimens were weighed and measured when freshly excised. The corresponding volume measurements calculated using TRUS and MRI were compared retrospectively with the measured volumes of freshly excised prostate.
The volume measured with TRUS and MRI was linearly related to the radical prostatectomy volume. The estimated increase in the prostate volumes measured with TRUS and MRI per specimen volume was 0.9508 and 0.9331 by regression analysis, respectively. If the prostate volumes were <35 cm(3), the prostate volumes measured with MRI overestimated the specimen volumes. If the prostate volumes were >35 cm(3), the prostate volumes measured with MRI underestimated the specimen volumes. The classic ellipsoid formula was adequate for determining the prostate volume.
In this study, MRI and TRUS gave different volumes. MRI is more accurate than TRUS for determining the prostate volume. However, because TRUS is inexpensive, noninvasive, and almost as accurate as MRI, it should be the preferred method for measuring the prostate volume.
比较经直肠超声（TRUS）与磁共振成像（MRI）用于估计前列腺体积的研究相对较少。在本研究中，我们将MRI和TRUS测量的前列腺体积与手术标本体积进行了比较。
73例患者在根治性前列腺切除术前行前列腺TRUS检查。所有标本在新鲜切除时称重并测量。将使用TRUS和MRI计算的相应体积测量值与新鲜切除前列腺的测量体积进行回顾性比较。
TRUS和MRI测量的体积与根治性前列腺切除体积呈线性相关。通过回归分析，TRUS和MRI测量的每个标本体积的前列腺体积估计增加分别为0.9508和0.9331。如果前列腺体积<35 cm³，MRI测量的前列腺体积高估了标本体积。如果前列腺体积>35 cm³，MRI测量的前列腺体积低估了标本体积。经典的椭球体公式足以确定前列腺体积。
在本研究中，MRI和TRUS得出的体积不同。MRI在确定前列腺体积方面比TRUS更准确。然而，由于TRUS价格低廉、无创且几乎与MRI一样准确，它应是测量前列腺体积的首选方法。
