Evaluation between 3.0 T vs 1.5 T MRI in Detection of Brain Metastasis using Double Dose Gd-DTPA
Journal of the Korean Society of Magnetic Resonance in Medicine
;
: 101-108, 2005.
Article
in English
| WPRIM
| ID: wpr-91263
ABSTRACT
PURPOSE:
Early detection of small brain metastases is important. The purpose of this study was to compare the detectability of brain metastases according to the size between 1.5 T and 3.0 T MRI. MATERIALS ANDMETHODS:
We reviewed 162 patients with primary lung cancer who were examined for TNM staging. After administration of double dose of Gd-DTPA, MR imaging was performed with SPGR by 3.0 T MRI and then with T1 SE sequence by 1.5 T MRI. In each patient, three readers performed qualitative assessment. Sensitivity, positive predictive value, and diagnostic accuracy were calculated in 3.0 T and 1.5 T MRI according to size. Using the signal intensity (SI) measurements between the metastatic nodules and adjacent tissue, nodule-to-adjacent tissue SI ratio was calculated.RESULTS:
Thirty-one of 162 patients had apparent metastatic nodules in the brain at either 1.5 T or 3.0 T MR imaging. 143 nodules were detected in 3.0 T MRI, whereas 137 nodules were detected at 1.5 T MRI. Six nodules, only detected in 3.0 T MRI, were smaller than 3.0 mm in dimension. Sensitivity, positive predictive value, and diagnostic accuracy in 3.0 T MRI were 100 %, 100 %, and 100 % respectively, and in 1.5 T MRI were 95.8 %, 88.3 %, and 85.1 % respectively. SI ratio was significantly higher in the 3.0 T MRI than 1.5 T MRI (p=0.025).CONCLUSION:
True positive rate of 3.0 T MRI with Gd-DTPA was superior to 1.5 T MRI with Gd-DTPA in detection of metastatic nodules smaller than 3.0 mm.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Brain
/
Magnetic Resonance Imaging
/
Gadolinium DTPA
/
Lung Neoplasms
/
Neoplasm Metastasis
/
Neoplasm Staging
Type of study:
Diagnostic study
/
Qualitative research
/
Screening study
Limits:
Humans
Language:
English
Journal:
Journal of the Korean Society of Magnetic Resonance in Medicine
Year:
2005
Type:
Article
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