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Determinations of prostate volume at 3-Tesla using an external phased array coil: comparison to pathologic specimens
Jacob Sosna1, Neil M Rofsky, Sandra M Gaston
1Department of Radiology, Beth Israel Deaconess Medical Center, Harvard Medical School, 330 Brookline Avenue, Boston, MA 02215, USA.
Academic Radiology
|August 30, 2003
Summary
Magnetic resonance imaging (MRI) at 3-Tesla using torso phased-array coils accurately measures prostate volume. This technique provides in vivo measurements comparable to ex vivo surgical specimen volumes.
Area of Science:
- Radiology
- Medical Imaging
- Oncology
Background:
- Accurate prostate volume measurement is crucial for treatment planning and monitoring.
- Traditional methods may have limitations in precision.
Purpose of the Study:
- To compare different techniques for measuring in vivo prostate volumes.
- To evaluate the accuracy of torso phased-array imaging at 3-Tesla for prostate volume assessment.
Main Methods:
- Eleven patients undergoing radical prostatectomy were imaged at 3-Tesla using a torso phased-array coil and multiplanar fast spin echo (FSE) T2-weighted imaging.
- Surgical specimens were imaged, and volumes were compared to magnetic resonance (MR) derived volumes using ellipsoid and planimetric methods.
- Three-dimensional (3D) images of excised prostates were generated.
Main Results:
- Correlation coefficients (r2) for ellipsoid formula methods ranged from 0.325 to 0.751.
- The highest in vivo r2 was achieved using a combination of sagittal and axial image dimensions.
- Planimetric volume and 3D specimen volume rendering showed high correlations (r2=0.652 and r2=0.86, respectively).
Conclusions:
- Surface coil prostate imaging at 3-Tesla yields undistorted images suitable for volume assessment.
- In vivo volume determinations using this technique closely approximate ex vivo imaging volume determinations.