[Clinical Application of Cardiac Magnetic Resonance Imaging in a Tertiary Referral Hospital in China].

OBJECTIVES: To review clinical application of cardiac magnetic resonace (CMR) imaging in a tertiary hospital. METHODS: A total of 344 medical records were reviewed in relation to the use of CMR imaging over one year period in a tertiary hospital in China. Data regarding indications for CMR imaging, cardiac structure and function, late gadolinium enhancement (LGE), and diagnoses made from CMR imaging were extracted and examined. RESULTS: Detection of heart failure and cardiomyopathies was the most common reason for CMR imaging requests [164 (47.7%) of requests], which was followed by diagnoses of coronary artery disease [79 (23.0%) of requests] and ventricular arrhythmia [65 (18.9%) of requests]. Quantitative analyses were made in 319 (92.7%) cases, with 208 (65.2%) patients being identified with ventricular dilatation and 46 (14.4%) patients being identified with right ventricular dilatation. Apart from 74 (21.5%) cases for which a confirmed diagnosis could not be obtained, CMR imaging assessment corrected 21.2% (73 patients) and confirmed 57.3% (197 patients) of initial referral diagnoses. CONCLUSIONS: CMR imaging is mainly used for structural and functional assessments of hearts, which can help identify abnormalities that are not detected by other imaging modalities. It can provide incremental diagnostic, therapeutic, and prognostic information.

[Comparison of Quantification of Myocardial Infarct Size by One Breath Hold Single Shot PSIR Sequence and Segmented FLASH-PSIR Sequence at 3. 0 Tesla MR].

OBJECTIVE: To compare the two sequences [single shot true-FISP-PSIR (single shot-PSIR) and segmented-turbo-FLASH-PSIR (segmented-PSIR)] in the value of quantification for myocardial infarct size at 3. 0 tesla MRI. METHODS: 38 patients with clinical confirmed myocardial infarction were served a comprehensive gadonilium cardiac MRI at 3. 0 tesla MRI system (Trio, Siemens). Myocardial delayed enhancement (MDE) were performed by single shot-PSIR and segmented-PSIR sequences separatedly in 12-20 min followed gadopentetate dimeglumine injection (0. 15 mmol/kg). The quality of MDE images were analysed by experienced physicians. Signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR) between the two techniques were compared. Myocardial infarct size was quantified by a dedicated software automatically (Q-mass, Medis). RESULTS: All objectives were scanned on the 3. 0T MR successfully. No significant difference was found in SNR and CNR of the image quality between the two sequences (P>0. 05), as well as the total myocardial volume, between two sequences (P>0. 05). Furthermore, there were still no difference in the infarct size [single shot-PSIR (30. 87 ± 15. 72) mL, segmented-PSIR (29. 26±14. 07) ml], ratio [single shot-PSIR (22. 94%±10. 94%), segmented-PSIR (20. 75% ± 8. 78%)] between the two sequences (P>0. 05). However, the average aquisition time of single shot-PSIR (21. 4 s) was less than that of the latter (380 s). CONCLUSION: Single shot-PSIR is equal to segmented-PSIR in detecting the myocardial infarct size with less acquisition time, which is valuable in the clinic application and further research.