[Comparative magnetic resonance imaging of renal space-occupying lesions with a high and low field MRI system]. / Vergleichende magnetresonanztomographische Darstellung renaler Raumforderungen an einem Hoch- und einem Niederfeld-MRT-System.

PURPOSE: A prospective study of the diagnostic accuracy and image quality of two MRI systems in the detection of renal tumors was investigated. MATERIALS AND METHODS: 34 patients with the clinical suspicion of a space-occupying renal lesion were examined by MRI with a low field (0.2 Tesla magnet) and a high field (1.5 Tesla magnet) for comparison. An "informed" and a "blind" observer evaluated all of the MR images. In addition, the signal-to-noise and contrast-to-noise ratios were evaluated as second quality parameters. RESULTS: In 29 cases the results could be compared with a confirmed release diagnosis. Diagnostic accuracy was comparable with both systems (Sensitivity for both observer on LF apparatus: 83%, HF apparatus: 81%) although the signal-to-noise and contrast-to-noise ratios were significantly poorer at low field. CONCLUSIONS: The low field system in comparable to the high field MRI for detection and differentiation of renal space-occupying lesions.