Medizinische Universität Graz Austria/Österreich - Forschungsportal - Medical University of Graz
Gewählte Publikation:
SHR Neuro Krebs Kardio Lipid Stoffw Microb
Wehrschuetz, M; Aschauer, M; Portugaller, H; Stix, A; Wehrschuetz-Sigl, E; Hausegger, K; Ebner, F.
Review of source images is necessary for the evaluation of gadolinium-enhanced MR angiography for renal artery stenosis.
Cardiovasc Intervent Radiol. 2004; 27(5): 441-446.
Doi: 10.1007/s00270-004-0047-z
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- Führende Autor*innen der Med Uni Graz
- Wehrschütz Martin
- Co-Autor*innen der Med Uni Graz
- Aschauer Manuela
- Ebner Franz
- Portugaller Rupert
- Stix Alexander
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- Abstract:
- The purpose of this study was to assess interobserver variability and accuracy in the evaluation of renal artery stenosis (RAS) with gadolinium-enhanced MR angiography (MRA) and digital subtraction angiography (DSA) in patients with hypertension. The authors found that source images are more accurate than maximum intensity projection (MIP) for depicting renal artery stenosis. Two independent radiologists reviewed MRA and DSA from 38 patients with hypertension. Studies were post-processed to display images in MIP and source images. DSA was the standard for comparison in each patient. For each main renal artery, percentage stenosis was estimated for any stenosis detected by the two radiologists. To calculate sensitivity, specificity and accuracy, MRA studies and stenoses were categorized as normal, mild (1-39%), moderate (40-69%) or severe (> or =70%), or occluded. DSA stenosis estimates of 70% or greater were considered hemodynamically significant. Analysis of variance demonstrated that MIP estimates of stenosis were greater than source image estimates for both readers. Differences in estimates for MIP versus DSA reached significance in one reader. The interobserver variance for MIP, source images and DSA was excellent (0.80< kappa< or = 0.90). The specificity of source images was high (97%) but less for MIP (87%); average accuracy was 92% for MIP and 98% for source images. In this study, source images are significantly more accurate than MIP images in one reader with a similar trend was observed in the second reader. The interobserver variability was excellent. When renal artery stenosis is a consideration, high accuracy can only be obtained when source images are examined.
- Find related publications in this database (using NLM MeSH Indexing)
- Adolescent -
- Adult -
- Aged -
- Aged, 80 and over -
- Analysis of Variance -
- Angiography, Digital Subtraction -
- Child -
- Contrast Media -
- Female -
- Gadolinium DTPA - diagnostic use
- Humans - diagnostic use
- Image Processing, Computer-Assisted - diagnostic use
- Magnetic Resonance Angiography - methods
- Male - methods
- Middle Aged - methods
- Observer Variation - methods
- Radiographic Image Enhancement - methods
- Renal Artery Obstruction - diagnosis
- Sensitivity and Specificity - diagnosis
- Find related publications in this database (Keywords)
- magnetic resonance
- angiography
- renal artery stenosis
- MIP
- source images