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Endoscopic MRI
K Inui1, S Nakazawa, J Yoshino
1Department of Internal Medicine, Fujita Health University, School of Medicine, Second Teaching Hospital, Nagoya, Japan.
Abstract:
We used a new magnetic resonance endoscope with a small radiofrequent (RF) coil attached to the tip. After insertion of the instrument into the second portion of the duodenum, patients were placed in a magnetic resonance imaging (MRI) scanner. Fast spoiled gradient-recalled acquisition (SPGR) pulse sequences were used for this method. After plain scans, six axial scans were performed after intravenous injection of 20 ml of gadolinium-diethylenetriaminepentaacetic acid (DTPA) contrast medium. We performed endo-MRI on 22 patients, 13 with pancreatic carcinoma, four with pancreatic cystoadenoma, and five with other diseases. In the patients with pancreatic carcinoma, tumors were delineated as low-intensity masses after injection of contrast medium. Dilated main pancreatic ducts were clearly defined. In eight patients with carcinoma of the head of the pancreas, tumors were clearly defined in seven (87.5%) cases. In the eighth case, motion artifact prevented acquisition of a clear image of the pancreas. For diagnosis of invasion of the portal vein, the sensitivity of endo-MRI was 80%, the specificity was 100%, and overall accuracy was 87.5%. The new technique of endo-MRI allows the precise diagnosis of pancreatic tumors.
Insights
A novel magnetic resonance endoscope aids in diagnosing pancreatic tumors. This advanced endoscopic MRI technique precisely visualizes tumors and pancreatic ducts, improving diagnostic accuracy.
Area of Science:
- Gastroenterology
- Medical Imaging
- Oncology
Background:
- Pancreatic tumors pose diagnostic challenges.
- Existing imaging modalities have limitations in precise tumor delineation.
Purpose of the Study:
- To evaluate the efficacy of a new magnetic resonance endoscope for diagnosing pancreatic tumors.
- To assess the diagnostic accuracy of endoscopic MRI (endo-MRI) in identifying pancreatic carcinoma and its invasion.
Main Methods:
- A novel magnetic resonance endoscope with an integrated radiofrequency coil was utilized.
- Patients underwent endoscopic insertion into the duodenum followed by MRI scanning using fast spoiled gradient-recalled acquisition (SPGR) sequences.
- Contrast-enhanced imaging with gadolinium-diethylenetriaminepentaacetic acid (DTPA) was performed.
Main Results:
- Endo-MRI successfully delineated pancreatic tumors as low-intensity masses post-contrast injection.
- Dilated main pancreatic ducts were clearly visualized.
- In pancreatic head carcinoma, tumors were accurately defined in 87.5% of cases.
- For portal vein invasion, endo-MRI demonstrated 80% sensitivity, 100% specificity, and 87.5% overall accuracy.
Conclusions:
- The new endoscopic MRI technique enables precise diagnosis of pancreatic tumors.
- Endo-MRI offers high accuracy in detecting pancreatic carcinoma and assessing vascular invasion.