Biomaterial Database

Accuracy of prostatic volume calculation in transrectal ultrasonography. 1995

A Kimura, and Y Kurooka, and K Hirasawa, and T Kitamura, and K Kawabe

Department of Urology, Branch Hospital, Tokyo, Japan.

BACKGROUND Estimation of the prostatic volume by transrectal ultrasonography is now widely used to evaluate the effect of conservative treatment and to improve the specificity of prostate specific antigen. Accurate measurement of prostatic volume is necessary for the calculation of prostate specific antigen density (PSA/prostatic volume ratio). METHODS Three dimensional models of the prostatic contour were constructed from transrectal ultrasonotomograms taken at 5 mm intervals in 20 cases. Using these models, the accuracy of ellipsoid volume calculation and prolate ellipse volume calculation were examined. For prolate ellipse volume calculation, prostatic length was measured in two ways; length (Lv) vertical to the transverse section, and length (Lp) parallel to the prostatic urethra. RESULTS Ellipsoid volume calculation showed errors of about 20%. Moreover, ellipsoid volume calculation fluctuated markedly (up to 50%) in accordance with the change of the scanning angle of the transverse section. The error of prolate ellipse volume calculation using Lp for length increased by an average of 25% as the angle moved away from the perpendicular. The prolate ellipse volume calculation using Lv for length was the most reliable method. The degree of error was least dependent on the angle between the plane and the axis. CONCLUSIONS Although prolate ellipse volume calculation was more accurate than ellipsoid volume calculation, it is essential to have the three axes cross at right angles to obtain an accurate value by the prolate ellipse volume calculation.

UI	MeSH Term	Description	Entries
D007091	Image Processing, Computer-Assisted	A technique of inputting two-dimensional or three-dimensional images into a computer and then enhancing or analyzing the imagery into a form that is more useful to the human observer.	Biomedical Image Processing,Computer-Assisted Image Processing,Digital Image Processing,Image Analysis, Computer-Assisted,Image Reconstruction,Medical Image Processing,Analysis, Computer-Assisted Image,Computer-Assisted Image Analysis,Computer Assisted Image Analysis,Computer Assisted Image Processing,Computer-Assisted Image Analyses,Image Analyses, Computer-Assisted,Image Analysis, Computer Assisted,Image Processing, Biomedical,Image Processing, Computer Assisted,Image Processing, Digital,Image Processing, Medical,Image Processings, Medical,Image Reconstructions,Medical Image Processings,Processing, Biomedical Image,Processing, Digital Image,Processing, Medical Image,Processings, Digital Image,Processings, Medical Image,Reconstruction, Image,Reconstructions, Image
D008297	Male		Males
D008433	Mathematics	The deductive study of shape, quantity, and dependence. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)	Mathematic
D011467	Prostate	A gland in males that surrounds the neck of the URINARY BLADDER and the URETHRA. It secretes a substance that liquefies coagulated semen. It is situated in the pelvic cavity behind the lower part of the PUBIC SYMPHYSIS, above the deep layer of the triangular ligament, and rests upon the RECTUM.	Prostates
D011470	Prostatic Hyperplasia	Increase in constituent cells in the PROSTATE, leading to enlargement of the organ (hypertrophy) and adverse impact on the lower urinary tract function. This can be caused by increased rate of cell proliferation, reduced rate of cell death, or both.	Adenoma, Prostatic,Benign Prostatic Hyperplasia,Prostatic Adenoma,Prostatic Hyperplasia, Benign,Prostatic Hypertrophy,Prostatic Hypertrophy, Benign,Adenomas, Prostatic,Benign Prostatic Hyperplasias,Benign Prostatic Hypertrophy,Hyperplasia, Benign Prostatic,Hyperplasia, Prostatic,Hyperplasias, Benign Prostatic,Hypertrophies, Prostatic,Hypertrophy, Benign Prostatic,Hypertrophy, Prostatic,Prostatic Adenomas,Prostatic Hyperplasias, Benign,Prostatic Hypertrophies
D012007	Rectum	The distal segment of the LARGE INTESTINE, between the SIGMOID COLON and the ANAL CANAL.	Rectums
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D014463	Ultrasonography	The visualization of deep structures of the body by recording the reflections or echoes of ultrasonic pulses directed into the tissues. Use of ultrasound for imaging or diagnostic purposes employs frequencies ranging from 1.6 to 10 megahertz.	Echography,Echotomography,Echotomography, Computer,Sonography, Medical,Tomography, Ultrasonic,Ultrasonic Diagnosis,Ultrasonic Imaging,Ultrasonographic Imaging,Computer Echotomography,Diagnosis, Ultrasonic,Diagnostic Ultrasound,Ultrasonic Tomography,Ultrasound Imaging,Diagnoses, Ultrasonic,Diagnostic Ultrasounds,Imaging, Ultrasonic,Imaging, Ultrasonographic,Imaging, Ultrasound,Imagings, Ultrasonographic,Imagings, Ultrasound,Medical Sonography,Ultrasonic Diagnoses,Ultrasonographic Imagings,Ultrasound, Diagnostic,Ultrasounds, Diagnostic