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Improving ultrasound-based prostate volume estimation

机译：改善基于超声的前列腺体积估计

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To define a new coefficient to be used in the formula (Volume?=?L x H x W x Coefficient) that better estimates prostate volume using dimensions of fresh prostates from patients who had transrectal ultrasound (TRUS) imaging prior to prostatectomy. The prostate was obtained from 153 patients, weighed and measured to obtain length (L), height (H), and width (W). The density was determined by water displacement to calculate volume. TRUS data were retrieved from patient charts. Linear regression analyses were performed to compare various prostate volume formulas, including the commonly used ellipsoid formula and newly introduced bullet-shaped formula. By relating measured prostate volumes from fresh prostates to TRUS-estimated prostate volumes, 0.66 was the best fitting coefficient in the (L x H x W x Coefficient) equation. This newfound coefficient combined with outlier removal yielded a linear equation with an R2 of 0.64, compared to 0.55 and 0.60, for the ellipsoid and bullet, respectively. By comparing each of the measured vs. estimated dimensions, we observed that the mean prostate height and length were overestimated by 11.1 and 10.8% using ultrasound (p 0.05). Overall, the ellipsoid formula underestimates prostate volumes by 18%, compared to an overestimation of 4.6 and 5.7% for the bullet formula and the formula using our coefficient, respectively. This study defines, for the first time, a coefficient based on freshly resected prostates as a reference to estimate volumes by imaging. Our findings support a bullet rather than an ellipsoid prostate shape. Moreover, substituting the coefficient commonly used in the ellipsoid formula by our calculated coefficient in the equation estimating prostate volume by TRUS, provides a more accurate value of the true prostate volume.
机译：定义公式中使用的新系数（体积？=？L x H x W x系数），以使用前列腺切除术前经直肠超声（TRUS）成像的患者的新鲜前列腺的尺寸更好地估计前列腺体积。从153名患者中获得前列腺，称重并测量以获得长度（L），高度（H）和宽度（W）。通过水置换确定密度以计算体积。从患者图表中检索TRUS数据。进行了线性回归分析以比较各种前列腺体积公式，包括常用的椭圆体公式和新引入的子弹形公式。通过将新鲜前列腺测量的前列腺体积与TRUS估计的前列腺体积相关联，0.66是（L xH xW x系数）方程中的最佳拟合系数。这个新发现的系数加上离群值消除产生了一个线性方程，R2为0.64，而椭球和子弹的R2分别为0.55和0.60。通过比较每个测量的尺寸与估计的尺寸，我们观察到使用超声检查时，平均前列腺高度和长度被高估了11.1％和10.8％。总体而言，椭球公式低估了前列腺体积18％，而子弹公式和使用我们系数的公式分别高估了4.6和5.7％。这项研究首次定义了以刚切除的前列腺为基础的系数，作为通过成像估计体积的参考。我们的研究结果支持子弹而非椭圆形前列腺形状。此外，将椭圆形公式中常用的系数替换为我们在TRUS估算前列腺体积的方程式中计算出的系数，可以提供更准确的真实前列腺体积值。

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