ABSTRACT
Objective To analyze the correlation between femoral head CT values in routine abdominopelvic CT scanning and hip bone mineral density(BMD)values in hip quantitative CT(QCT)measurements,and to investigate the diagnostic value of femoral head CT values for hip osteoporosis.Methods Totally 176 patients undergoing non-enhanced abdominopelvic CT scanning at some hospital from June 1,2021 to January 20,2022 were selected prospectively,and femoral head CT values and hip BMD values were measured on the scanned images.The patients were divided into a normal bone mass group,a reduced bone mass group and an osteoporosis group according to hip T values and the"China Guideline for the Diagnosis Criteria of Osteoporosis with Quantitative Computed Tomography(2018)".Analyses were carried out for the correlation between femoral head CT values and hip BMD values,the difference between femoral head CT values and BMD values of the two sides with paired t-test,the difference of CT values between the three groups with ANOVA and the diagnostic efficacy of femoral head CT values for diagnosing hip osteoporosis with AUC curve.Results The values of femoral head CT and hip BMD had a strong correlation(r=0.696),which were slightly higher on the left than on the right.The three groups had statistically significant differences of femoral head CT values at two sides(P=0.000),which were ranked according to CT values as the normal bone mass group,the reduced bone mass group and the osteoporosis group.Femoral head CT values and hip BMD values both reached the peak at the age of 41 to 50 years,and then decreased gradually.Femoral head CT values behaved well in predicting hip osteoporosis,with femoral head AUC value being 0.859 on the left and 0.846 on the right.Conclusion The values of femoral head CT and hip BMD had a strong correlation,and femoral head CT values are valuable for diagnosing osteoporosis.[Chinese Medical Equipment Journal,2023,44(9):64-68]
ABSTRACT
<p><b>OBJECTIVE</b>To explore the influence of conventional metal materials in oral cavity on brain magnetic resonance imaging (MRI).</p><p><b>METHODS</b>Four kinds of metal materials (metal ligature wire, forging hard and slotless denture, casting nichrome denture, casting copper alloy denture) in oral cavity were scanned through MRI. FSE sequence T1 weighted imaging (FSE T1), EPI diffusion-weighted imaging (DWI) sequence of ordinary, Propeller DWI imaging were used.</p><p><b>RESULTS</b>In FSE T1 sequence, metal ligature wire and forging hard and slotless denture produced serious false image, casting nichrome denture produced moderate false image, casting copper alloy denture produced only little false image. In EPI DWI sequence, obvious magnetic-sensitive false image were produced in the dissection tissue of the brain by metal ligature wire. While in Propeller DWI sequence, magnetic-sensitive false image were greatly reduced and satisfactory images were formed.</p><p><b>CONCLUSION</b>Different metal materials in oral cavity have different influence on the MRI. The false images produced by different metal materials are closely related to the type of the material. Magnetic-sensitive false images can be eliminated by Propeller DWI technique.</p>