单层TSE序列及多层HASTE序列磁共振胰胆管成像技术在临床应用价值的比较

目的:比较磁共振胰胆管成像技术的2种成像方法,探讨有助于临床诊断胆系病变的磁共振检查的最佳方法。方法:分析经手术病理或活检证实的35例胰胆管病变患者2种不同方法(单层TSE序列及多层HASTE序列)MRCP影像表现,比较二者显示胰胆管病变的优缺点。结果:单层TSE序列采集时间短,空间分辨率高,受运动伪影影响小;多层HASTE序列采集时间较长,运动伪影明显。结论:单层TSE-MRCP成像结合常规SE及梯度序列冠轴位相扫描是胰胆管病变的磁共振检查的最佳方法之一。     

HASTE序列单层法磁共振胰胆管成像与常规磁共振胰胆管成像的比较

目的比较HASTE序列单层法磁共振胰胆管成像(HASTE-MRCP)和常规磁共振胰胆管成像(OMRCP),评价HASTE-MRCP的临床应用价值。方法48例梗阻性黄疸和30例无黄疸患者行OMRCP、HASTE-MRCP单层扫描,比较2种技术诊断的准确性。结果2个序列均能显示胆管病变部位、疾病特征、近侧扩张胆管以及远侧正常胰胆管;显示扩张胆管直径2个序列间没有显著性差异;HASTE-MRCP单层法采集空间分辨率较高,且采集时间短,但受血管伪影影响较明显。OMRCP采集密度分辨率高,但运动伪影明显。结论单层采集HASTE-MRCP成像结合常规SE及梯度序列冠轴位相扫描是胰胆管病变磁共振检查的最佳方法之一。     

2种方法磁共振胆胰管成像对胆系结石的诊断价值

磁共振胆胰管成像(m agnetic resonance cholangiopancreatog-raphy,MRCP)已广泛用于胆胰管疾病的评价,目前MRCP成像序列多采用重T2加权快速自旋回波(turbo sp in echo,TSE)序列和半傅立叶采集单次激发自旋回波序列(half-Fourier acqu i-sition single-shot turbo sp in-echo,HASTE)[1]。成像方法有单层面厚层采集(以下简称厚层法)和多层面薄层采集最大强度投影重建(m aximum intensity projection,M IP)(以下简称薄层法)2种[2]。厚层法多采用单次激发TSE序列(single shot TSE,SSTSE)[3,4],也可采用HASTE序列[2,5]。薄层法以…     

磁共振胰胆管成像对诊断胆胰系统疾病的临床应用价值

目的评价磁共振胰胆管成像(MRCP)技术在胆胰系统疾病诊断中的应用价值.方法68例患者进行了MRCP检查,其中正常对照组11例,各种胰胆管病变组57例.扫描使用ELSCINTSGR2.0T超导磁共振成像仪,体线圈及呼吸门控触发技术.平扫采用自旋回波(SE)常规成像;MRCP采用快速自旋回波(FSE)重T2加权像进行薄层扫描.所得图像用最大强度投影法(MIP)进行三维(3D)重建.结果MRCP能清晰显示胰胆管的解剖结构,对胆道梗阻程度和梗阻部位判断的确诊率达100%,梗阻原因的确诊率达91.2%.结论MRCP检查的成功率高,胰胆管解剖结构显示清晰,适应于各种胰胆管疾病的诊断,可作为该系统疾病诊断的首选方法     

3.0T磁共振在腹部胰胆管成像中的应用

目的探讨3.0T磁共振在腹部胰胆管水成像中优势及其应用。方法搜集我院2011年1月～2011年4月进行腹部磁共振检查的患者50例,采用西门子Verio3.0T磁共振,8通道相阵控腹部线圈,haste序列,spair序列及MRCP胰胆管成像序列进行轴位相扫描。结果采用3.0T磁共振的haste序列能够在自由呼吸的状态下,缩短扫描时间同时获得高质量的图像;spair序列具有很好的脂肪抑制效果,能极大的提高对病变的显示;与haste技术结合的MRCP序列能对胰管、肝内胆管、胆囊、胆总管的病变显示的更加清楚。结论西门子3.0T磁共振并行采集技术及haste、spair序列在腹部扫描中,能获得高质量的图像。     

磁共振胰胆管成像在胆系梗阻性病变中的诊断价值

目的 评价磁共振胰胆管成像（MRCP）在胆系梗阻性病变中的临床应用价值。方法收集经手术病理或临床随访证实的胰胆系梗阻性病变46例，均作了厚层法及薄层法MRCP和MRI检查，39例作了FSPGR T1WI抑脂动态增强扫描，分析各类病变在MRCP及MRI上的表现。结果MRCP厚层法与薄层法各有优点，对胆管结石总的检出率为100％，对胆管炎性病变及恶性病变引起的胆管扩张显示清晰，炎性病变呈移形性扩张，肿瘤性病变呈截断征或圆锥征。结论厚层法及薄层法MRCP是诊断胆系结石的一种理想方法，结合运用MRI、动态增强扫描，对胆系炎性病变及肿瘤性病变可作出明确诊断。     

口服枸橼酸铁铵在胆胰系MRI中的应用价值评价

目的:评价口服枸橼酸铁铵在胆胰系MRI中的应用价值。方法:对86例怀疑有胰胆管系统疾病的患者行口服枸橼酸铁铵前、后MRCP及常规胆胰系MRI,对服用对比剂前后MRCP图像质量、邻近脏器边缘分辨力及各序列上胃十二指肠腔与肝脏的对比噪声比进行自身对照研究,由资深放射科医生对两组图像进行评价,SPSS统计软件进行统计分析。结果:服用对比剂后TrueFISP及HASTE序列均显示胃、十二指肠腔内信号显著降低,形成阴性对比;而FL2D序列胃、十二指肠腔内信号增强,形成阳性对比;胃十二指肠腔内液体造成的背景高信号被完全抑制,单层法与多层法MRCP图像质量及邻近的肝胆胰等结构边缘分辨力均明显提高。结论:口服枸橼酸铁铵能明显提高胆胰系MRI的成像质量,对诊断胆胰系病变具有重要的临床应用价值。     

磁共振胰胆管成像序列的比较研究

目的: 比较磁共振胰胆管成像(MRCP)不同序列对胰胆管树的显示能力及其临床应用.材料和方法: 对24例正常成年志愿者及30例胰胆管梗阻性疾病患者行FSE、FSE-XL和SSFSE MRCP检查,并对各扫描序列的胰胆管显示情况进行分析.结果: FSE-XL和SSFSE扫描序列对胰胆管及病变部位的显示明显优于常规FSE扫描序列,SSFSE又优于FSE-XL扫描序列.SSFSE扫描序列能充分显示正常胰胆管树,对胰胆管梗阻性疾病的检出率也较高.结论: SSFSE扫描序列与能多方位观察胰胆管情况的FSE-XL扫描序列联合应用,可明显提高对胰胆管梗阻性疾病的检出率.     

低场磁共振胰胆管成像诊断胆系疾病的潜能

目的阐述低场磁共振胰胆管成像(MRCP)诊断胆系疾病的潜能。方法 70例手术病理或临床证实的胰胆疾病患者包括胆囊切除术后胆管代偿性扩张2例,胆总管直径临界值4例,胆系结石49例,胆总管炎性狭窄4例,胰头癌4例以及胆管癌7例均经低场MRCP检查。全部操作是在0.35 TSIEMENS磁共振扫描仪上采用TSE T1WI、T2WI序列和MIP重建进行的。结果本组70例中,低场MRCP正确诊断胆系结石49例,胆总管炎性狭窄4例,胰头癌4例以及胆管癌7例,其诊断敏感性100%,特异性89.8%,准确性91.4%,阳性预测值100%以及阴性预测值90.7%。结论低场MRCP是诊断胰胆疾病的一种无创、安全、高效的影像技术,尤其对恶性病变极为敏感而提示其具有广阔的应用前景。     

口服钆喷替酸葡甲胺溶液行MR胰胆管成像的初步临床应用

目的　应用口服钆喷替酸葡甲胺 (Gd DTPTA)溶液作为胃肠道阴性对比剂 ,以降低胃肠道背景高信号 ,提高磁共振胰胆管成像 (MRCP)的图像质量。方法　用 5 0ml药瓶将Gd DTPA溶液稀释成不同浓度 (分别稀释为 5倍、10倍、15倍、2 0倍 ) ,并设空白对照组 ,行常规及MRCP扫描 ,以选择最佳的对比剂浓度。对 15例疑有胰胆管系统疾病的病人行口服对比剂前后MRCP检查 ,对比剂为稀释 5倍的Gd DTPA溶液 ( 1 488g/L) 2 5 0ml,磁场强度为 1 5T。MRCP成像方法有二维单层快速自旋回波 (FSE)序列及半傅立叶单次激发快速自旋回波 (HASTE)序列。结果　实验部分结果表明稀释 5倍的Gd DTPA溶液T2 WI信号降低最明显 ,达 5 9 3 % ,HASTE序列信号强度降低 82 45 % ,单层MRCP时所有稀释倍数液体信号强度均下降达 90 %以上。所有病例口服对比剂后MRCP扫描胃及十二指肠内液体高信号均较前有明显下降 ,图像质量明显提高 ,以单层MRCP序列胃肠道液体高信号抑制最明显。口服Gd DTPA溶液前后 ,胆总管、胰管及胆囊结构的显示程度等级评分差异有显著性意义 (P <0 0 5 )。结论　稀释 5倍的口服Gd DTPA溶液是一种安全有效地降低胃肠道液体高信号强度、改善MRCP图像质量的胃肠道阴性对比剂     

HASTE磁共振胰胆管成像诊断胆道恶性梗阻病变的价值

目的探讨HASTE磁共振胰胆管造影在胆道恶性梗阻病变诊断中的应用价值。方法分析经手术病理或活检证实的43例胆道恶性梗阻病变患者的HASTE-MRCP影像表现。结果HASTE-MRCP诊断胆道恶性梗阻,其定位诊断符合率为100%,定性诊断符合率为75%。结论HASTE-MRCP在胆道恶性梗阻性病变的诊断中具有良好的应用价值。     

多层螺旋CT胆管MPR与MRCP 的初步对照研究

目的评价多层螺旋CT胆管多平面重建成像(MSCTC-MPR)的临床应用价值。方法63例胆道病变患者,分别行MSCTC和MR I检查,其中有48例在MSCT检查时做MSCTC-MPR成像,51例患者MR I检查时做MRCP成像,共36例同时进行了2项检查,对检查结果作统计学分析。结果MSCTC-MPR和MRCP的成像成功率各为100%(48/48),92.2%(47/51);二者的定位诊断准确率均为100%;定性为肿瘤病变及非肿瘤病变的诊断准确率均各为95.8%,95.7%;MPR对胆道结石诊断的敏感度、特异度及准确度为74.1%、100%和85.4%,MRCP为96.2%、81.0%和89.4%。结论MSCTC-MPR与MRCP对胆道病变的诊断价值相近,二者各有优势。     

MR cholangiopancreatography using HASTE sequences.

AIM: The aim of this pictorial review is to describe applications of cholangiopancreatography (MRCP) using half-Fourier (HASTE) MR sequences. MATERIALS AND METHODS: 350 patients were imaged over a four-year period with a 1.54 Tesla Siemens Vision scanner and a phased array body coil. The HASTE MR sequence was applied in multiple planes with an acquisition time of 13 seconds allowing breath hold techniques. In addition, a single-shot technique provided single slice acquisitions with a thickness of 20 mm. A chemical fat suppression algorithm reduced intra-abdominal MR high signal. RESULTS: HASTE MRCP accurately determines the presence of level of biliary obstruction in up to 97% of patients. Common bile duct stones are detected with a sensitivity of 93%. Acute cholecystitis is depicted on HASTE MR as pericholecystic high signal in 41/45 (91%) patients and gall stones are detected with a 93% sensitivity. CONCLUSION: HASTE MRCP offers a non-invasive, rapid imaging method to evaluate the gallbladder, common bile duct and pancreas. Its multi-planar, fluid sensitive capabilities are of particular value in detecting common bile duct stones and acute cholecystitis.     

Imaging of the intrahepatic biliary tree with thick slice MR cholangiography]

PURPOSE: To assess the value of single shot fast spin echo MR sequence (SS-FSE) in the evaluation of the normal and pathologic intrahepatic biliary tree. MATERIAL AND METHODS: 418 consecutive patients (457 examinations) referred for clinical and/or biological suspicion of biliary obstruction underwent MR cholangiopancreatography (MRCP). All patients were imaged with a Signa 1.5 T GE MR unit, with High Gradient Field Strength and Torso Phased Array Coil. Biliary ducts were imaged with SS-FSE sequence, coronal and oblique coronal 20 mm thick slices on a 256 x 256 matrix. Total acquisition time was 1 second. Source images were reviewed by two radiologists blinded to clinical information. In case of disagreement, a third radiologist's opinion was requested. In all cases, MRCP results were compared with direct biliary tract evaluation, other imaging studies and clinical and biological follow-up. RESULTS: In all cases, MRCP produced high quality images. Numerous branch of division were observed although the peripheral intrahepatic ducts were well seen in more than 90% in an area 2 cm below the capsule. The number of division was statistically higher when mechanical obstruction was present. Intrahepatic calculi or peripheral cholangiocarcinoma were well detect by MRCP. For the detection of cholangitis, MRCP sensitivity was 87.5% but the positive predictive value was only 57.7% because of a high number of false positive. The diagnosis of primary sclerosing cholangitis must be made only on strict criteria and slightly dilated peripheral bile ducts unconnected to the central ducts in several hepatic segments were a characteristic MR sign of primary sclerosing cholangitis. CONCLUSION: MRCP can be proposed as a first intention imaging technique for the evaluation of intrahepatic ducts.     

Dual breath-hold magnetic resonance cine evaluation of global and regional cardiac function

The purpose of our study was to evaluate the accuracy of a multislice cine magnetic resonance imaging (MRI) technique with parallel imaging in regard to global and regional left ventricular function. Forty-two individuals underwent cine MRI on a 1.5-tesla scanner. Cine MRI used a steady-state free precession technique and was performed as a single-slice technique (nonTSENSE cine) and an accelerated multislice technique (TSENSE cine) with five slices per breath-hold. End diastolic volume (EDV), end systolic volume (ESV), and ejection fraction (EF) were evaluated for all data sets and in regard to regional wall motion and regional wall motion analysis, and quantitative regional wall thickness and systolic thickening were also assessed. EDV, ESV, and EF based on TSENSE cine showed excellent correlation to the nonTSENSE cine approach (all r²=0.99, P<0.001). While EDV evaluations showed a small underestimation for TSENSE cine, ESV and EF showed accurate results compared with nonTSENSE cine. Both readers showed good agreement (κ=0.72) in regional wall motion assessment comparing both techniques. Data acquisition for the multislice approach was significantly shorter (∼75%) that in single-slice cine. We conclude that accurate evaluation of regional wall motion and left ventricular EF is possible using accelerated multislice cine MR with high spatial and temporal resolution.     

Erfassung der globalen Herzfunktion mit Real-time-trueFISP in einer Atemphase

Real-time multislice cine techniques lead to inaccurate results in ventricular volumes based on limited temporal resolution. The purpose of the study is to evaluate a real-time cine technique with parallel imaging algorithms in comparison to standard segmented techniques. Twelve patients underwent cardiac cine MRI using real-time multislice cine trueFISP. Temporal resolution was improved using parallel acquisition techniques (iPAT) and data acquisition was performed in a single breath-hold along the patients' short axis. Evaluation of EDV, ESV, EF and myocardial mass was performed and results compared to a standard segmented single-slice cine trueFISP. Combination of real-time cine trueFISP and iPAT provided a temporal resolution of 48 ms. Results of the multislice approach showed an excellent correlation to standard single-slice trueFISP for EDV (0.94, p <0.001), ESV (0.97, p <0.001) EF (0.99, p <0.001) and myocardial mass (0.93, p <0.001). No significant differences could be found. The use of parallel acquisition techniques (PAT) allow for a substantial improvement of temporal resolution in real-time cine MRI (<50 ms). Therefore these techniques enable an accurate and exact quantification of global ventricular function.     

磁共振胰胆管造影成像技术探讨

 目的:评估磁共振胰胆管造影成像的技术和应用价值.方法:用重T<,2>加权快速自旋回波(TSE)序列和脂肪抑制技术作MR胰胆管造影成像45例.所有图像均作最大信号强度投影(MIP)后处理.结果:45例患者中,胆系疾患28例,胆系外疾患17例.此技术可清楚描画胆管及各种疾病的异常改变,对正常胰管及其分支的显示不佳.结论:MR胰胆管造影不用造影剂,是安全、可靠、非损伤性的检查方法,在胰胆管疾病诊断方面具有很大潜力.