Document Detail

Identifying acoustic scattering sources in normal renal parenchyma in vivo by varying arterial and ureteral pressures.
MedLine Citation:
PMID:  1413270     Owner:  NLM     Status:  MEDLINE    
Ultrasonic backscatter properties of normal dog kidney parenchyma are examined in vivo to determine sources of acoustic scattering. We systematically varied the renal perfusion and ureteral pressures to obtain detailed information about scattering sources that could not be seen under in vitro conditions. These data suggest that in normal parenchyma the principal sources of backscatter are Bowman's capsule at low frequencies (2.5-5.0 MHz) and glomerular arterioles at high frequencies (5.0-15.0 MHz). We found that the integrated backscatter coefficient (IBC) in normally perfused kidney cortex is approximately half that measured in the ischemic organ at all frequencies. Ischemia was found to reduce scatterer size estimates (D) by 10% at low frequencies and increase D54% at high frequencies. Acute obstruction of the kidney, under diuresis, produced an 11% increase in D at low frequencies, and no significant change in D at high frequencies. These variations in backscatter measurements are explained in terms of changes in the microscopic anatomy of the kidney.
M F Insana; J G Wood; T J Hall
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Ultrasound in medicine & biology     Volume:  18     ISSN:  0301-5629     ISO Abbreviation:  Ultrasound Med Biol     Publication Date:  1992  
Date Detail:
Created Date:  1992-11-25     Completed Date:  1992-11-25     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  0410553     Medline TA:  Ultrasound Med Biol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  587-99     Citation Subset:  IM    
Department of Diagnostic Radiology, University of Kansas Medical Center, Kansas City 66160-7234.
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MeSH Terms
Ischemia / physiopathology,  ultrasonography*
Kidney / blood supply,  physiopathology,  ultrasonography*
Ureteral Obstruction / physiopathology,  ultrasonography*

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