AIM： TO determine if a nasojejunal tube （NJT） is required for optimal examination of enteroclysis and if patients can be examined only in the supine position. METHODS： Data were collected from all patients undergo...AIM： TO determine if a nasojejunal tube （NJT） is required for optimal examination of enteroclysis and if patients can be examined only in the supine position. METHODS： Data were collected from all patients undergoing small bowel （SB） magnetic resonance imaging （MRI） examination over a 32-mo period. Patients either underwent a magnetic resonance （MR） follow-through （MRFT） or a MR enteroclysis （MRE） in the supine position. The quality of proximal and distal SB distension as well as the presence of motion artefact and image quality were assessed by 2 radiologists. RESULTS： One hundred and fourteen MR studies were undertaken （MRFT-49, MRE-65） in 108 patients in the supine position only. Image artefact was more frequent in MRE than in MRFT （29.2% vs 18.4%）, but was not statistically significant （P = 0.30）. Adequate distension of the distal SB was obtained in 97.8% of MRFT examinations and in 95.4% of MRE examinations, respectively. Proximal SB distension was, however, less frequently optimal in MRFT than in MRE （P = 0.0036）, particularly in patients over the age of 50 years （P = 0.0099）. Image quality was good in all examinations. CONCLUSION： All patients could be successfully iraaged in the supine position. MRE and MRFT are equivalent for distal SB distension and artefact effects. Proximal SB distension is frequently less optimal in MRFT than in MRE. MRE is, therefore, the preferred MR examination method of the SB.展开更多
To assess the role of dynamic contrast-enhanced MRI (DCE-MRI) in thediagnosis and differentiation of prostatic cancer (PC). Methods: Five volunteers, 36 patients withbenign prostatic hyperplasia (BPH) and 13 patients ...To assess the role of dynamic contrast-enhanced MRI (DCE-MRI) in thediagnosis and differentiation of prostatic cancer (PC). Methods: Five volunteers, 36 patients withbenign prostatic hyperplasia (BPH) and 13 patients with biopsy-proven prostate cancer underwentconventional MRI, DCE-MRI and delayed enhancement MRI. The value of the signal intensity in DCE-MRIwas measured and calculated to draw the time-signal intensity curve of the normal peripheral zone(PZ), the prostate cancer and the benign prostatic hyperplasia. Results: In DCE-MRI, the normalperipheral zone was enhanced mildly and slowly and the peak value was located in late phase. Theenhancement of the lesions in 36 patients with the benign prostatic hyperplasia was obvious in earlyphase and strengthened gradually, and then turned to decrease in late phase after peak value. Thelesions in 9 of 13 cases with prostate cancer were enhanced obviously in early phase and washed outrapidly, and the peak value was located in early phase, but the peak value was in mediate and latephase in the other 4 cases with diffuse lesion in the prostate on T_2WI. Conclusion: In DCE-MRI, theenhancement patterns of the normal peripheral zone, the prostate cancer and the benign prostatichyperplasia were significantly different. DCE-MRI was very useful in the diagnosis anddifferentiation of prostate cancer.展开更多
AIM: To evaluate the benefit and effectiveness of MRarterioportography (MR-AP) to achieve the highest sensitivity for detection and evaluation of hepatocellular carcinoma (HCC). METHODS: Twenty liver cirrhosis patient...AIM: To evaluate the benefit and effectiveness of MRarterioportography (MR-AP) to achieve the highest sensitivity for detection and evaluation of hepatocellular carcinoma (HCC). METHODS: Twenty liver cirrhosis patients with suspected HCC were included before transarterial chemoembolization. In all patients double-enhanced Magnetic resonance imaging (MRI) was performed. A bolus of 10 mL Magnevist was injected through a selectively placed catheter in the superior mesenteric artery and MRI of the liver was performed in arterioportographic phase. Two independent readers evaluated number, size and localization of detected lesions. Diagnostic quality was determined using a 4-point scale. Differences were analyzed for significance using a t -test. Interobserver variability was calculated. RESULTS: In all 20 patients (100%), MR-AP was feasible. Diagnostic quality was, in all cases, between 1 and2 for both modalities and readers. MR-AP detected significantly more lesions than double-enhanced MRI (102.5 vs 61, respectively, P < 0.0024). The inter-observer variability was 0.881 for MRI and 0.903 for MR-AP. CONCLUSION: Our study confirmed that the MR-AP as an additional modality for detection of HCC is beneficial, as significantly more lesions were detected compared to MRI with liver-specific contrast.展开更多
文摘AIM： TO determine if a nasojejunal tube （NJT） is required for optimal examination of enteroclysis and if patients can be examined only in the supine position. METHODS： Data were collected from all patients undergoing small bowel （SB） magnetic resonance imaging （MRI） examination over a 32-mo period. Patients either underwent a magnetic resonance （MR） follow-through （MRFT） or a MR enteroclysis （MRE） in the supine position. The quality of proximal and distal SB distension as well as the presence of motion artefact and image quality were assessed by 2 radiologists. RESULTS： One hundred and fourteen MR studies were undertaken （MRFT-49, MRE-65） in 108 patients in the supine position only. Image artefact was more frequent in MRE than in MRFT （29.2% vs 18.4%）, but was not statistically significant （P = 0.30）. Adequate distension of the distal SB was obtained in 97.8% of MRFT examinations and in 95.4% of MRE examinations, respectively. Proximal SB distension was, however, less frequently optimal in MRFT than in MRE （P = 0.0036）, particularly in patients over the age of 50 years （P = 0.0099）. Image quality was good in all examinations. CONCLUSION： All patients could be successfully iraaged in the supine position. MRE and MRFT are equivalent for distal SB distension and artefact effects. Proximal SB distension is frequently less optimal in MRFT than in MRE. MRE is, therefore, the preferred MR examination method of the SB.
文摘To assess the role of dynamic contrast-enhanced MRI (DCE-MRI) in thediagnosis and differentiation of prostatic cancer (PC). Methods: Five volunteers, 36 patients withbenign prostatic hyperplasia (BPH) and 13 patients with biopsy-proven prostate cancer underwentconventional MRI, DCE-MRI and delayed enhancement MRI. The value of the signal intensity in DCE-MRIwas measured and calculated to draw the time-signal intensity curve of the normal peripheral zone(PZ), the prostate cancer and the benign prostatic hyperplasia. Results: In DCE-MRI, the normalperipheral zone was enhanced mildly and slowly and the peak value was located in late phase. Theenhancement of the lesions in 36 patients with the benign prostatic hyperplasia was obvious in earlyphase and strengthened gradually, and then turned to decrease in late phase after peak value. Thelesions in 9 of 13 cases with prostate cancer were enhanced obviously in early phase and washed outrapidly, and the peak value was located in early phase, but the peak value was in mediate and latephase in the other 4 cases with diffuse lesion in the prostate on T_2WI. Conclusion: In DCE-MRI, theenhancement patterns of the normal peripheral zone, the prostate cancer and the benign prostatichyperplasia were significantly different. DCE-MRI was very useful in the diagnosis anddifferentiation of prostate cancer.
文摘AIM: To evaluate the benefit and effectiveness of MRarterioportography (MR-AP) to achieve the highest sensitivity for detection and evaluation of hepatocellular carcinoma (HCC). METHODS: Twenty liver cirrhosis patients with suspected HCC were included before transarterial chemoembolization. In all patients double-enhanced Magnetic resonance imaging (MRI) was performed. A bolus of 10 mL Magnevist was injected through a selectively placed catheter in the superior mesenteric artery and MRI of the liver was performed in arterioportographic phase. Two independent readers evaluated number, size and localization of detected lesions. Diagnostic quality was determined using a 4-point scale. Differences were analyzed for significance using a t -test. Interobserver variability was calculated. RESULTS: In all 20 patients (100%), MR-AP was feasible. Diagnostic quality was, in all cases, between 1 and2 for both modalities and readers. MR-AP detected significantly more lesions than double-enhanced MRI (102.5 vs 61, respectively, P < 0.0024). The inter-observer variability was 0.881 for MRI and 0.903 for MR-AP. CONCLUSION: Our study confirmed that the MR-AP as an additional modality for detection of HCC is beneficial, as significantly more lesions were detected compared to MRI with liver-specific contrast.
