| Compartmental analysis of renal BOLD MRI data: introduction and validation. | |
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MedLine Citation:
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PMID: 22183077 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVES: Functional blood oxygenation level-dependent (BOLD) magnetic resonance imaging is a powerful tool to assess renal function, but BOLD analysis using T2* image differentiation of cortex and medulla is laborious and prone to errors. We developed and validated an alternative compartmental analysis method to differentiate renal cortical and medullary BOLD relaxivity index, R2*. This method uses whole-kidney regions of interest (ROI), thus eliminating the need for anatomic cortical and medullary definition. MATERIALS AND METHODS: Nine hypertensive patients and 11 domestic pigs, some with renal artery stenosis, were studied using BOLD MRI before and after injection of furosemide, which reduces medullary oxygen consumption. R2* in cortex and medulla estimated before and after furosemide with the compartmental method were compared with those obtained using conventional T2* image selection for ROI (manual ROI method), and a reference method with ROIs obtained using contrast-enhanced computerized tomography images were coregistered for the same kidneys. RESULTS: All 3 methods provided similar cortical R2* values, but the Bland-Altman methods' agreement confidence intervals of the reference and compartmental-derived medullary R2* response in humans and pigs were smaller than those in the manual ROI method. Operator dependency in swine was lower in the compartmental method, and its estimates of variation were almost 1/3 compared with the manual ROI method. CONCLUSIONS: The new compartmental method, which is less labor intensive than the conventional method, provides comparable and less variable kidney R2* estimations, especially in renal medulla. This method could be useful for analysis of kidney BOLD data. |
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Authors:
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Behzad Ebrahimi; Monika Gloviczki; John R Woollard; John A Crane; Stephen C Textor; Lilach O Lerman |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural; Validation Studies |
Journal Detail:
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Title: Investigative radiology Volume: 47 ISSN: 1536-0210 ISO Abbreviation: Invest Radiol Publication Date: 2012 Mar |
Date Detail:
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Created Date: 2012-02-22 Completed Date: 2012-06-28 Revised Date: 2013-04-15 |
Medline Journal Info:
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Nlm Unique ID: 0045377 Medline TA: Invest Radiol Country: United States |
Other Details:
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Languages: eng Pagination: 175-82 Citation Subset: IM |
Affiliation:
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Division of Nephrology and Hypertension, Mayo Clinic, Rochester, MN 55905, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Diuretics / diagnostic use Furosemide / diagnostic use Health Status Indicators Hypertension / diagnosis*, pathology Kidney / blood supply* Magnetic Resonance Imaging / instrumentation*, methods Swine Time Factors Tomography, X-Ray Computed |
| Grant Support | |
ID/Acronym/Agency:
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C06 RR018898-01/RR/NCRR NIH HHS; C06-RR018898/RR/NCRR NIH HHS; DK73608/DK/NIDDK NIH HHS; DK77013/DK/NIDDK NIH HHS; HL085307/HL/NHLBI NIH HHS; HL77131/HL/NHLBI NIH HHS; P01 HL085307-05/HL/NHLBI NIH HHS; R01 DK073608-06/DK/NIDDK NIH HHS; R01 HL077131-07/HL/NHLBI NIH HHS; R21 DK077013-02/DK/NIDDK NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Diuretics; 54-31-9/Furosemide |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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