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MRI with superparamagnetic iron oxide: efficacy in the detection and characterization of focal hepatic lesions
C Poeckler-Schoeniger1, J Koepke, F Gueckel
1Department of Diagnostic Radiology, Klinikum Mannheim Universitätsklinikum, Faculty of Clinical Medicine Mannheim of University of Heidelberg, Germany.
Abstract:
The purpose of this study was to evaluate the potential of superparamagnetic iron oxide particles (SPIO) as tissue specific contrast agent in magnetic resonance (MR) imaging in detection and characterization of focal hepatic lesions. We investigated 45 patients with focal hepatic lesions. T1-weighted SE (TR 650/TE 15 ms) and T2-weighted SE (TR 2015-2030/TE 45 and 90 ms) unenhanced images were obtained. After SPIO application we performed T1-weighted images with and T2-weighted images with and without fat suppression using the same image parameters. Liver signal intensity decreased by 74% (min 47%, max 83%) on T2-weighted images after application of the contrast agent. Benign lesions (FNH, adenoma) showed an average signal drop of 40% (min 20%, max 47%) whereas malignant lesions showed no significant change of signal intensity on post-contrast images. The mean tumor-to-liver contrast-to-noise ratio (C/N) was improved in all post-contrast sequences irrespective of the lesion type. An additional increase of tumor-to-liver contrast by use of fat suppression technique could be established in the slightly T2-weighted sequence (TE 45 ms). In metastases, divided in different size groups, we could determine a significant size relation of tumor-to-liver C/N. After SPIO application the number of detected lesions increased distinctly, especially small foci are more easily demonstrated. SPIO particles are a efficacious contrast agent for MR examinations of the liver. For tumor characterization T1- and T2-weighted pre- and post-contrast images are necessary. The T1-weighted sequences are helpful to differentiate benign lesions such as cysts and hemangiomas from malignant lesions. Detection and differential diagnoses of hepatic lesions are improved by use of the SPIO-particles.
Insights
Superparamagnetic iron oxide particles (SPIO) enhance MRI detection and characterization of liver lesions. SPIO improved contrast-to-noise ratios and lesion visualization, aiding in differentiating benign from malignant findings.
Area of Science:
- Radiology
- Medical Imaging
- Nanotechnology
Background:
- Focal hepatic lesions require accurate detection and characterization for effective patient management.
- Superparamagnetic iron oxide particles (SPIO) offer potential as tissue-specific contrast agents in Magnetic Resonance (MR) imaging.
Purpose of the Study:
- To evaluate SPIO as a contrast agent for MR imaging in detecting and characterizing focal hepatic lesions.
- To assess the impact of SPIO on liver signal intensity and lesion conspicuity.
Main Methods:
- Investigated 45 patients with focal hepatic lesions.
- Acquired pre- and post-SPIO T1- and T2-weighted MR images, including fat suppression sequences.
- Analyzed liver signal intensity, lesion signal change, and tumor-to-liver contrast-to-noise ratio (C/N).
Main Results:
- Liver signal intensity decreased by 74% on T2-weighted images post-SPIO.
- Benign lesions showed a 40% signal drop, while malignant lesions had no significant change.
- Tumor-to-liver C/N improved across all post-contrast sequences; fat suppression further enhanced contrast.
- lesion detection increased, particularly for small foci.
Conclusions:
- SPIO particles are effective contrast agents for MR liver examinations.
- Pre- and post-contrast T1- and T2-weighted images are crucial for tumor characterization.
- SPIO-enhanced MR imaging improves the detection and differential diagnosis of hepatic lesions.