#Prostate mr contrast volume software#

Many of these have been used in volume measurement studies of multiple organs with or without reference methods.

#Prostate mr contrast volume software#

The number of different DICOM viewer software programs available for assessing CT images is extensive, and currently, many software programs have specific tools for CT volume measurements. 17 Computed tomography volume measurements have recently reached an accuracy of ☐.8%, 12 compared with ±5% 14 to ☑0% 15 in the early 1980s. 9- 13 Accurate volume measurements allow development of reference value ranges and serve as an objective tool for characterizing severity of prostatomegaly.Ĭomputed tomography volumes of objects and organs in both dogs and humans have been compared with reference volumes, with actual volumes determined by the water displacement method 12, 14, 15 or known water content, 12, 15, 16 or with resection weights. 9- 13 Earlier, one-dimensional parameters, such as length, width, and height, have been measured later, prostate volume has been calculated by advanced software. 9- 13 Prostate gland boundaries, lesions, location, and surrounding tissues are more visible in CT than with ultrasonographic imaging, allowing more exact measurements to be taken.

Several studies on dogs have shown CT imaging to be a reliable tool for investigating prostate gland structure and size. 4- 8 Recently, computed tomography (CT) has become widely available in small animal practice. 1- 5 Traditionally, the size of the prostate gland has been evaluated using subjective assessments such as rectal palpation or radiographic or ultrasonographic imaging. Prostate diseases are common among intact male dogs and often lead to prostate gland enlargement.

Veterinary Teaching Hospital of the University of Helsinki.

digital imaging and communication in medicine.

The findings supported using OsiriX ® software for CT prostatic volume measurements in dogs. When the prostate CT volume was compared using a Bland–Altman plot with the reference volume acquired by the water displacement method, agreement without consistent bias between the methods was shown, and over 90% of measurements were located within the 95% limits of agreement.

No significant differences emerged between different protocols and slice thicknesses using a linear mixed effects model. Intra- and interobserver variability and the effect of contrast enhancement were found to be minimal when a one-way analysis of variance model and intraclass correlation coefficients were used. Observer agreement analyses were performed, and prostatic CT volume measurements were compared with water displacement volume measurements. In the second prospective study, two observers measured the prostate volume of 10 cadavers using five different CT protocols and eight cadavers using three slice thicknesses. In the first retrospective study, two observers measured prostate volumes of 13 client-owned dogs thrice on noncontrast and contrast CT images.

The objectives of this two-part, observer agreement, methods comparison study were to assess observer agreement and the effects of varying CT technical parameters for volume measurements of canine prostate glands on CT images using OsiriX ® DICOM viewer software. Computed tomography (CT) is an established method for evaluating dogs with suspected prostatic disease however, publications assessing the effects of varying factors on prostate volume measurements are lacking.