Computer Aided Evaluation of Upper Urinary Tract Obstruction

V. Neeman, M. Hershko, N. Reisner, I. Leichter, G. Hidas, D. Pode, M. Duvdevani

2009

Abstract

The purpose of this study is to examine a method for quantitative estimation of upper urinary tract clearance rate using conventional fluoroscopic images. To obtain quantitative information proportional to the amount of contrast media in the renal pelvis we used videodensitometric methods. The semi-quantitative densitometry included normalization procedure, logarithmic processing of the system response and non-specific density variations removing. The method was tested by analyzing 7 nephrostogram and 3 retrograde pyelography studies. The clearance rate was estimated by measuring the clearances curve in arbitrary units. Regression fitting of the clearances curve by an exponential decay yielded a correlation coefficient of 0.94±0.02. The integrated radio-density of the contrast media was found to decrease by 6±3% per minute, and the area of the contrast agent in the renal pelvis decreased by 5±2% per minute. The radio-density measurements during the first 10 minutes of the examination were sufficient to yield the overall exponential clearances curve. It was concluded that this method will enable to estimate quantitatively the degree of upper urinary tract obstruction by using only the initial phase of a routine urological modality.

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Paper Citation


in Harvard Style

Neeman V., Hershko M., Reisner N., Leichter I., Hidas G., Pode D. and Duvdevani M. (2009). Computer Aided Evaluation of Upper Urinary Tract Obstruction . In Proceedings of the 1st International Workshop on Medical Image Analysis and Description for Diagnosis Systems - Volume 1: Workshop MIAD, (BIOSTEC 2009) ISBN 978-989-8111-77-7, pages 24-30. DOI: 10.5220/0001815100240030


in Bibtex Style

@conference{workshop miad09,
author={V. Neeman and M. Hershko and N. Reisner and I. Leichter and G. Hidas and D. Pode and M. Duvdevani},
title={Computer Aided Evaluation of Upper Urinary Tract Obstruction},
booktitle={Proceedings of the 1st International Workshop on Medical Image Analysis and Description for Diagnosis Systems - Volume 1: Workshop MIAD, (BIOSTEC 2009)},
year={2009},
pages={24-30},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0001815100240030},
isbn={978-989-8111-77-7},
}


in EndNote Style

TY - CONF
JO - Proceedings of the 1st International Workshop on Medical Image Analysis and Description for Diagnosis Systems - Volume 1: Workshop MIAD, (BIOSTEC 2009)
TI - Computer Aided Evaluation of Upper Urinary Tract Obstruction
SN - 978-989-8111-77-7
AU - Neeman V.
AU - Hershko M.
AU - Reisner N.
AU - Leichter I.
AU - Hidas G.
AU - Pode D.
AU - Duvdevani M.
PY - 2009
SP - 24
EP - 30
DO - 10.5220/0001815100240030