A Radial Magnetic Resonance Imaging Method for Imaging Abdominal Neoplasms
- 1.7k Downloads
Abdominal magnetic resonance imaging (MRI) has progressed rapidly during the last 12 years. The development of new hardware and software has allowed the implementation of faster and better pulse sequences, and MRI is now used routinely in the clinic as a complement to, or as the method of choice over other imaging techniques such as ultrasound (US) and computed tomography (CT). Magnetic resonance imaging combines good spatial resolution, lack of radiation, non-inva-siveness, and three-dimensional imaging capability. This method provides useful information for the detection and characterization of focal liver lesions that cannot be diagnosed with US or CT (Robinson, 2000). In particular for small lesions (< 1 cm2), studies have shown that the specificity and sensitivity of MRI is better than US and CT (Ward et al., 2005).
The standard MRI protocol for liver and most abdominal imaging applications consists of acquiring T1-weighted, T2-weighted, and contrast-enhanced images. All these methods are used for the detection of lesions but each has a different role in terms of lesion characterization. T1-weighted images acquired with lipid and water in- and out-of-phase, respectively, are used primarily for the characterization of neoplasms such as adenomas, focal nodular hyperplasia, regenerative nodules, well-differentiated hepatocellular carcinoma, nodular regenerative hyperpla-sia, renal clear cell carcinoma, and angi-omyolipoma (Ichikawa and Araki, 1999; Outwater et al., 1998).
KeywordsFocal Nodular Hyperplasia Breath Hold Focal Liver Lesion Renal Clear Cell Carcinoma Liver Neoplasm
Unable to display preview. Download preview PDF.
- Cieszanowski, A., Szeszkowski, W., Golebiowski, M., Bielecki, D.K., Grodzicki, M., and Pruszynski, B. 2002. Discrimination of benign from malignant hepatic lesions based on their T2-relaxation times calculated from moderately T2-weighted turbo SE sequence. Eur. Radiol. 12:2273–2279.PubMedGoogle Scholar
- Goldberg, M.A., Hahn, P.F., Saini, S., Cohen, M.S., Reimer, P., Brady, T.J., and Mueller, P.R. 1993. Value of T1 and T2 relaxation times from echoplanar MR imaging in the characterization of focal hepatic lesions. Am. J. Roentgenol. 160:1011–1017.Google Scholar
- Kim, Y.H., Saini, S., Blake, M.A., Harisinghani, M., Chiou, Y.Y., Lee, W.J., Yu, J.S., and Hahn, P.F. 2005. Distinguishing hepatic metastases from hemangiomas: qualitative and quantitative diagnostic performance through dual echo respiratory-triggered fast spin echo magnetic resonance imaging. J. Comput. Assist. Tomogr. 29:571–579.PubMedCrossRefGoogle Scholar
- Olcott, E.W., Li, K.C., Wright, G.A., Pattarelli, P.P., Katz, D.S., Ch'en, I.Y., and Daniel, B.L. 1999. Differentiation of hepatic malignancies from hemangiomas and cysts by T2 relaxation times: early experience with multiply refocused four-echo imaging at 1.5 T. J. Magn. Reson. Imaging 9:81–86.PubMedCrossRefGoogle Scholar
- Tang, Y., Yamashita, Y., Namimoto, T., Abe, Y., and Takahashi, M. 1997. Liver T2-weighted MR imaging: comparison of fast and conventional half-Fourier single-shot turbo spin-echo, breath-hold turbo spin-echo, and respiratory-triggered turbo spin-echo sequences. Radiology 203:766–772.PubMedGoogle Scholar
- Ward, J., Robinson, P.J., Guthrie, J.A., Downing, S., Wilson, D., Lodge, J.P., Prasad, K.R., Toogood, G.J., and Wyatt, J.I. 2005. Liver metastases in candidates for hepatic resection: comparison of helical CT and gadolinium- and SPIO-enhanced MR imaging. Radiology 237:170–180.PubMedCrossRefGoogle Scholar