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Hepatic tumors: magnetic resonance and CT appearance
Abstract:
The magnetic resonance (MR) features of primary and metastatic hepatic tumors were analyzed and compared with CT findings in 28 patients. MR images were obtained on a 0.35-Tesla superconducting magnet using a variety of spin echo and inversion recovery imaging techniques. The normal liver appeared homogeneous and of moderate intensity. Tumors typically appeared as masses of increased intensity on spin echo images and diminished intensity on inversion recovery images. Tumors had prolonged T1 and T2 times, which varied in different types of tumors and within regions of a single tumor. A specific T1 and/or T2 time could not be ascribed to any tumor. Tumor intensity varied greatly depending on the imaging techniques employed, becoming isointense with normal liver on some imaging sequences. MR and CT detected lesions equally well, but internal architecture and the relationship of tumors to hepatic vascular structures were better displayed on MR.
Insights
Magnetic resonance (MR) imaging effectively detects liver tumors, offering superior visualization of internal architecture and vascular relationships compared to CT scans. MR findings, including prolonged T1 and T2 times, aid in characterizing hepatic masses.
Area of Science:
- Radiology
- Medical Imaging
- Oncology
Background:
- Accurate detection and characterization of hepatic tumors are crucial for patient management.
- Conventional imaging modalities like CT have limitations in depicting tumor internal architecture and vascularity.
Purpose of the Study:
- To analyze and compare the magnetic resonance (MR) features of primary and metastatic hepatic tumors with CT findings.
- To evaluate the utility of MR imaging in characterizing liver lesions.
Main Methods:
- Retrospective analysis of MR images from 28 patients with hepatic tumors.
- MR imaging performed on a 0.35-Tesla superconducting magnet using spin echo and inversion recovery techniques.
- Comparison of MR findings with CT scans for lesion detection and characterization.
Main Results:
- MR and CT demonstrated comparable lesion detection rates.
- MR provided superior visualization of tumor internal architecture and relationships to hepatic vasculature.
- Tumors typically showed increased intensity on spin echo and decreased intensity on inversion recovery images.
- Prolonged T1 and T2 relaxation times were observed in tumors, with significant variability.
Conclusions:
- MR imaging is a valuable tool for evaluating hepatic tumors, offering enhanced display of internal architecture and vascularity.
- While MR relaxation times (T1 and T2) are prolonged in tumors, specific values cannot be definitively ascribed to tumor types.
- MR imaging complements CT in the comprehensive assessment of liver lesions.