A novel method for estimating the urine drainage time from the renal collecting system.
Fluoroscopic image processing
Nephrostogram
Renal obstruction
Urine drainage rate
Journal
Abdominal radiology (New York)
ISSN: 2366-0058
Titre abrégé: Abdom Radiol (NY)
Pays: United States
ID NLM: 101674571
Informations de publication
Date de publication:
06 2021
06 2021
Historique:
received:
16
09
2020
accepted:
21
11
2020
revised:
13
11
2020
pubmed:
3
1
2021
medline:
22
6
2021
entrez:
2
1
2021
Statut:
ppublish
Résumé
Partial obstruction of the upper urinary tract is a common urological pathology that leads to progressive atrophy and dysfunction of the kidney. Most methods for evaluating the urine drainage rate, to assess the severity of partial obstruction, involve injection of markers into the blood stream and therefore the filtration rate from the blood effects the drainage rate. This study presents a novel method for assessing the drainage rate from the upper urinary tract by analyzing sequential fluoroscopic images from a routine nephrostogram, in which contrast material is introduced directly into the renal collecting system. Fluoroscopic images from 36 nephrostograms, following percutaneous nephrolithotomy, were retrospectively evaluated, 19 with a dilated renal pelvis. A radiological model for calculating the radiopacity of the renal pelvis, which reflects the amount of contrast material in each sequential image, was developed. Using this model, an algorithm was designed for generating a drainage curve and calculating the "drainage time" t Analysis of images of a step-wedge phantom made of an increasing number of contrast material layers showed that the calculated radiopacity of each step was proportional to the amount of contrast material, independent of the background attenuation. Analysis of the nephrostograms showed that the drainage curves highly fitted an exponential function (R = 0.961), with a significantly higher t The developed method may be used for a quantitative and accurate estimation of the urine drainage rate.
Identifiants
pubmed: 33386909
doi: 10.1007/s00261-020-02880-1
pii: 10.1007/s00261-020-02880-1
doi:
Substances chimiques
Contrast Media
0
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
2647-2655Références
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