Khanal Umesh, Sah Ramswarth, Mahato Sushil Kumar, Katwal Shailendra, Gurung Ghanshyam
Department of Radiology and Imaging, Tribhuvan University Teaching Hospital, Maharajgunj Medical Campus, Maharajgunj, Kathmandu, Nepal.
Department of Radiology and Imaging, National Trauma Center, Kathmandu, Nepal.
JNMA J Nepal Med Assoc. 2025 Mar;63(283):154-158. doi: 10.31729/jnma.8899. Epub 2025 Mar 31.
Magnetic Resonance Imaging is a common diagnostic tool used to evaluate various clinical conditions. Different fat suppression techniques such as Short Tau Inversion Recovery and Dixon are employed to enhance diagnostic accuracy. The choice of fat suppression sequence varies based on availability and performance. This study aimed to compare Contrast Ratio and Contrast-to-Noise Ratio of Short Tau Inversion Recovery and Dixon technique.
This observational cross-section study was performed in the Department of Radiology from 8 September 2023 to 7 September 2024 after the approval by the Institutional Review Committee (Reference number: 151/080/081(6-11)E2). Using a complete census method during the study period, MRI-lumbar spines of 384 adult patients were included in the study. Signal intensity values of the lesion, adjacent normal tissue, and noise were recorded for calculation of Contrast Ratio and Contrast-to-Noise Ratio.
Among 384 cases, 191 (49.74%) were male and 193 (50.26%) were female with median age 46 (IQR: 35-60) years. The median value of contrast ratio and contrast-to-noise ratio were 0.31 (IQR: 0.14-0.50) and 8.74 (IQR: 3.82-15.50) respectively for STIR sequence while median value of contrast ratio and contrast-to-noise ratio were 0.44 (IQR: 0.19-0.74) and 11.95 (IQR: 5.38-23.18) respectively for Dixon sequence, higher than Short Tau Inversion Recovery.
Contrast Ratio and Contrast to Noise Ratio were found higher and background noise lower for Dixon compared to Short Tau Inversion Recovery.
磁共振成像（MRI）是一种用于评估各种临床病症的常见诊断工具。不同的脂肪抑制技术，如短反转时间反转恢复序列（STIR）和狄克逊（Dixon）技术，被用于提高诊断准确性。脂肪抑制序列的选择因可用性和性能而异。本研究旨在比较短反转时间反转恢复序列和狄克逊技术的对比率和对比噪声比。
本观察性横断面研究于2023年9月8日至2024年9月7日在放射科进行，经机构审查委员会批准（参考编号：151/080/081(6-11)E2）。在研究期间采用全面普查方法，纳入了384例成年患者的腰椎MRI检查。记录病变、相邻正常组织和噪声的信号强度值，以计算对比率和对比噪声比。
在384例病例中，男性191例（49.74%），女性193例（50.26%），中位年龄46岁（四分位间距：35 - 60岁）。STIR序列的对比率和对比噪声比的中位值分别为0.31（四分位间距：0.14 - 0.50）和8.74（四分位间距：3.82 - 15.50），而狄克逊序列的对比率和对比噪声比的中位值分别为0.44（四分位间距：0.19 - 0.74）和11.95（四分位间距：5.38 - 23.18），高于短反转时间反转恢复序列。
与短反转时间反转恢复序列相比，狄克逊序列的对比率和对比噪声比更高，背景噪声更低。
