Young Taik Oh MD, Presenter: Nothing to Disclose

Jang Hwan Kim MD, Abstract Co-Author: Nothing to Disclose

Joo Hee Kim, Abstract Co-Author: Nothing to Disclose

Myeong-Jin Kim MD, PhD, Abstract Co-Author: Nothing to Disclose

Ki Whang Kim MD, Abstract Co-Author: Nothing to Disclose

The prolate ellipse volume calculation method is commonly used to measure the prostate volume with transrectal ultrasonogram and MRI. We evaluated the accuracy of prolate ellipse volume calculation depending on the morphological pattern of the prostate using MR image with endorectal coil

Prostate volumes were retrospectively measured by planimetry volume (PV) technique and prolate ellipse volume (PEV) calculation in 30 patients with prostate MR images. MR imaging using endorectal coil was performed with 1.5 T MR unit. Axial and sagittal T2-weighted fast spin echo images (FOV 12cm, matrix 256x 256) were used for prostate volume measurement. In PV technique, the outline of the prostate border was manually traced with the cursor on a slice-by-slice basis and multiplied by slice thickness. The PV was used as the standard of reference. In PEV calculation, width (W, in axial), height (H, in mid sagittal), and length (L, in mid sagittal) were measured and the volume was calculated using the formula W x H x L x 0.523. Prostate volumes measured by PV technique and PEV calculation were compared. Correlation between these two values depending on prostate size and different W/H, W/L, H/L ratio was determined.

Overall, PEV calculation correlated well with PV (R2;0.976, standard error; 2.5). Prosate volume correlation was not affected by prostate size, W/L and H/L ratios. However, significant difference in PV and PEV was noted in a subgroup with W/H ratio less or equal to 1.8 (p=0.02).

Morphological analysis with W/H ratio showed that prostate volume determined by prolate ellipse volume calculation is accurate when the W/H ratio is more than 1.8 but becomes significantly different in a subgroup with W/H ratio less or equal to 1.8. .An adjusted formula may be needed in this subgroup.

The prolate ellipse volume calculation method is commonly used to measure the prostate volume with transrectal ultrasonogram and MRI. We evaluated the accuracy of prolate ellipse volume calculation depending on the morphological pattern of the prostate using MR image with endorectal coil

Prostate volumes were retrospectively measured by planimetry volume (PV) technique and prolate ellipse volume (PEV) calculation in 30 patients with prostate MR images. MR imaging using endorectal coil was performed with 1.5 T MR unit. Axial and sagittal T2-weighted fast spin echo images (FOV 12cm, matrix 256x 256) were used for prostate volume measurement. In PV technique, the outline of the prostate border was manually traced with the cursor on a slice-by-slice basis and multiplied by slice thickness. The PV was used as the standard of reference. In PEV calculation, width (W, in axial), height (H, in mid sagittal), and length (L, in mid sagittal) were measured and the volume was calculated using the formula W x H x L x 0.523. Prostate volumes measured by PV technique and PEV calculation were compared. Correlation between these two values depending on prostate size and different W/H, W/L, H/L ratio was determined.

Overall, PEV calculation correlated well with PV (R2;0.976, standard error; 2.5). Prosate volume correlation was not affected by prostate size, W/L and H/L ratios. However, significant difference in PV and PEV was noted in a subgroup with W/H ratio less or equal to 1.8 (p=0.02).

Morphological analysis with W/H ratio showed that prostate volume determined by prolate ellipse volume calculation is accurate when the W/H ratio is more than 1.8 but becomes significantly different in a subgroup with W/H ratio less or equal to 1.8. .An adjusted formula may be needed in this subgroup.

Oh, Y, Kim, J, Kim, J, Kim, M, Kim, K, Can We Increase the Accuracy of Prostate Volume Measurement? Comparison of Prostate Volume between Planimetry and Prolate Ellipse Volume Calculation on MR Image with Endorectal Coil: Morphological Pattern Analysis.  Radiological Society of North America 2005 Scientific Assembly and Annual Meeting, November 27 - December 2, 2005 ,Chicago IL. http://archive.rsna.org/2005/4412188.html