CAJ | 학술논문

目的评价1.5 T HDx磁共振成像(MRI)系统新技术颅脑容积磁共振成像(BRAVO)在颅脑磁共振增强检查中的价值.方法对31例颅脑肿瘤患者或町疑颅脑转移的患者行常规磁共振增强检查和BRAVO序列检查.分别计算自旋回波(SE)序列及BRAVO序列的病灶显示数量,采用χ2检验方法对结果进行比较;对比图像质量,分别测量两序列灰质、白质及背景噪声信号值,运用公式计算信噪比(SNR)、对比噪声比(CNR)以及灰白质对比度.结果在31例颅脑MRI检查中,SE序列共显示病灶121个,BRAVO序列共显示病灶124个,两者比较其差异无统计学意义(P＞0.05);BRAVO与SE序列的白质信噪比(17.828 7±2.753 1和27.226 1±5.571 2),灰质信噪比(12.964 2±1.796 3和23.174 1±4.513 3)差异均有统计学意义(P＜0.05),sE序列的灰质、白质信噪比均高于BRAVO序列.BRAVO与SE序列的灰白质对比噪声比(CNRWM/GM)(4.865 2±1.1370和4.051 6±1.3900),灰白质对比度(635.211 3±136.385 0和93.494 2±25.1724),差异均有统计学意义(P＜0.05),BRAVO序列均高于SE序列.结论 BRAVO序列实现了磁共振颅脑增强容积快速扫描的可能,扫描一个序列能重建出多平面图像,同时以高空间分辨率、较少的血管搏动伪影以及较高的灰白纸对比度为颅脑磁共振扫描提供更广阔的前景,在颅脑磁共振增强检查中起到重要的补充作用.
목적 평개1.5 T HDx자공진성상(MRI)계통신기술로뇌용적자공진성상(BRAVO)재로뇌자공진증강검사중적개치.방법 대31례로뇌종류환자혹정의로뇌전이적환자행상규자공진증강검사화BRAVO서렬검사.분별계산자선회파(SE)서렬급BRAVO서렬적병조현시수량,채용χ2검험방법대결과진행비교;대비도상질량,분별측량량서렬회질、백질급배경조성신호치,운용공식계산신조비(SNR)、대비조성비(CNR)이급회백질대비도.결과 재31례로뇌MRI검사중,SE서렬공현시병조121개,BRAVO서렬공현시병조124개,량자비교기차이무통계학의의(P＞0.05);BRAVO여SE서렬적백질신조비(17.828 7±2.753 1화27.226 1±5.571 2),회질신조비(12.964 2±1.796 3화23.174 1±4.513 3)차이균유통계학의의(P＜0.05),sE서렬적회질、백질신조비균고우BRAVO서렬.BRAVO여SE서렬적회백질대비조성비(CNRWM/GM)(4.865 2±1.1370화4.051 6±1.3900),회백질대비도(635.211 3±136.385 0화93.494 2±25.1724),차이균유통계학의의(P＜0.05),BRAVO서렬균고우SE서렬.결론 BRAVO서렬실현료자공진로뇌증강용적쾌속소묘적가능,소묘일개서렬능중건출다평면도상,동시이고공간분변솔、교소적혈관박동위영이급교고적회백지대비도위로뇌자공진소묘제공경엄활적전경,재로뇌자공진증강검사중기도중요적보충작용.
Objective To evaluate the brain volume imaging (BRAVO) sequence built in 1.5T HDx magnetic resonance imaging (MRI) system for enhanced scanning of the brain.Methods Thirty-one patients with primary tumor or suspected metastatic lesions of the brain underwent both MRI with routine contrast-enhanced spin echo(SE) sequence and BRAVO sequence.Number of lesions revealed under both SE sequence and BRAVO sequence was calculated and compared by Chi-square test.Then the values of grey and white matters, and value of noise on the background signal under both sequences were measured.According to these values, signal to noise ratio (SNR) about gray matter and white matter, contrast to noise ratio between white matter and gray matter (CNRwmkm) were computed.In addition, white/gray matter contrast was measured and calculated, and the results were compared and statistically analyzed with J-test.Results There were 121 lesions revealed by SE sequence vs 124 by BRAVO sequence in the 31 patients, with no statistically significant difference in number of lesions noted by the two sequences (P>0.05).Significant differences were noted in both white matter SNR [BRAVO:(17.828 7±2.753 1); SE: (27.226 1 ±5.571 2)] and gray matter SNR [BRAVO: (12.964 2±1.796 3); SE:(23.174 1 ±4.513 3); P＜0.05 ].SNRwm/cm of SE sequence was higher than that of BR A VO sequence.CNRwm/cm on SE sequence was lower than that on BRAVO sequence [BRAVO: (4.865 2±1.137 0); SE: (4.051 6±1.390 0),P＜0.05], as was gray/white matter contrast on SE sequence than that on BRAVO sequence [BRAVO.(635.211 3±○136.385 0); SE: (93.494 2±25.172 4); P＜0.05].Conclusions BRAVO sequence may enable quicker brain volumetric scan in enhanced MRI.With BRAVO, multi-plane images can be reconstructed by scanning one sequence.In addition, the higher spatial resolution, less vascular motion artifacts and higher gray/white matter contrast with BRAVO technique mean a wider prospect for brain MRI, where it can be an important supplementary in enhanced MR imaging of the brain.