Summary Purpose: Evaluate the agreement between limited MRI, which using T1W sequence or STIR sequence in coronal direction, with standard MRI in diagnosis early femoral head necrosis(FHN) occurring in high risk patients. Subjects and methods : descriptive cross-sectional study was performed on 58 patients, who warediagnosed of femoral head osteonecrosis at stage 2 or higher according to the Arlet Ficat classification. The patients were performed hip joints MRI at the Radiology Center, Bach Mai Hospital from June 2020 to August 2021. Results: The agreement in FHN staggingbetween limited MRI using T1Wsequence, or limited MRI using STIR sequence with the standard MRI was 0.98 and 0.86, respectively. The agreement in measurement extent of osteonecrosis areabetween limited MRI using T1Wsequence, or limited MRI using STIR sequence with the standard MRI was 0.98 and 0.85. Conclusion : There was excellent agreement between the full and limited MR examinations both forstagging and determining the extent of osteonecrosis area. The time and potential cost reduction achieved when taking limited MRImay lead to more widespread using in patient care. Key words: femoral head osteonecrosis, hip MRI, limited hip MRI.

Summary Purpose: To describe the variants and the anormalies of coronary artery on 128-row computed tomography (CT). Material and method : 90 patients were treated at 103 hospital from Oct. 2020 to Jul. 2021. The characteristic figures of coronary artery assessed on 128-row CT included: the site of ostium, course, abnormal enlargement of the branch… Results : 84.4% of the patients had a right dominant system and Ramus intermedius branch was seen in 57.8%. The anomalous origins of LM and RCA were found in 3.3% for each branch. The atrophies of LCx and RCA were 7.8% and 2.2%, respectively. Conclusion : 128-row detector CT images is helpful for detecting the variants and the anormalies of coronary artery. Key words: computed tomography, coronary artery, variant, anormaly.