Felix Harder1, Fabian K Lohöfer1, Georgios A Kaissis1, Christoph Zoellner1, Omar Kamal2, Christoph Katemann3, Andreas Hock3, Julien Senegas3, Johannes M Peeters4, Ernst J Rummeny1, Dimitrios Karampinos1, Rickmer F Braren5. 1. Institute for Diagnostic and Interventional Radiology, School of Medicine of the Technical University of Munich, Ismaninger Straße 22, D-81675 Munich, Germany. 2. Institute for Diagnostic and Interventional Radiology, School of Medicine of the Technical University of Munich, Ismaninger Straße 22, D-81675 Munich, Germany; Department of Radiology, South Egypt Cancer Institute, Assiut University, Egypt. 3. Philips Healthcare, Hamburg, Germany. 4. Philips Healthcare, Best, The Netherlands. 5. Institute for Diagnostic and Interventional Radiology, School of Medicine of the Technical University of Munich, Ismaninger Straße 22, D-81675 Munich, Germany. Electronic address: rbraren@tum.de.
Abstract
PURPOSE: To evaluate the performance of a novel camera-based breathing navigation system in respiratory-triggered (CRT) 3D-magnetic resonance cholangiopancreatography (MRCP) at 3T MRI. METHODS: Two 3D-MRCP data sets were acquired subsequently within one imaging session with traditional respiratory belt- (BRT) or camera- (CRT) based triggering in 28 patients. Overall image quality, blurring, motion artifacts and discernibility of the pancreaticobiliary tree (PBT) structures were scored on a 4-point scale retrospectively by 2 radiologists. The contrast ratio between the common bile duct and its adjacent tissue was measured by region-of-interest (ROI) analysis. The signal intensity increase at the duct boundaries was quantified by line profiles to objectify blurring and motion artifacts. The extracted respiratory signal curves were analyzed for signal quality and trigger timing. RESULTS: Total scan time was 72 s for both acquisitions. CRT yielded significantly better ratings in image quality, background suppression, blurring and discernibility of PBT structures compared to BRT. Contrast ratios were significantly higher in CRT (0.94 ± 0.03) than in BRT (0.93 ± 0.03) exams; paired t test P = 0.0017. Line profile slopes through the common bile duct revealed significantly higher values in CRT (42.23 ± 8.74% of maximum intensity/mm) compared to BRT (36.06 ± 8.96% of maximum intensity/mm; paired t test P < 0.0001). Camera-derived respiratory signal curves showed a higher SNR, lower standard deviation of the signal amplitude and less incorrect triggering than the respiratory belt-derived respiratory signal curves. CONCLUSION: Camera-based respiratory triggering significantly improves image quality of 3D-MRCP compared to conventional respiratory belt triggering.
PURPOSE: To evaluate the performance of a novel camera-based breathing navigation system in respiratory-triggered (CRT) 3D-magnetic resonance cholangiopancreatography (MRCP) at 3T MRI. METHODS: Two 3D-MRCP data sets were acquired subsequently within one imaging session with traditional respiratory belt- (BRT) or camera- (CRT) based triggering in 28 patients. Overall image quality, blurring, motion artifacts and discernibility of the pancreaticobiliary tree (PBT) structures were scored on a 4-point scale retrospectively by 2 radiologists. The contrast ratio between the common bile duct and its adjacent tissue was measured by region-of-interest (ROI) analysis. The signal intensity increase at the duct boundaries was quantified by line profiles to objectify blurring and motion artifacts. The extracted respiratory signal curves were analyzed for signal quality and trigger timing. RESULTS: Total scan time was 72 s for both acquisitions. CRT yielded significantly better ratings in image quality, background suppression, blurring and discernibility of PBT structures compared to BRT. Contrast ratios were significantly higher in CRT (0.94 ± 0.03) than in BRT (0.93 ± 0.03) exams; paired t test P = 0.0017. Line profile slopes through the common bile duct revealed significantly higher values in CRT (42.23 ± 8.74% of maximum intensity/mm) compared to BRT (36.06 ± 8.96% of maximum intensity/mm; paired t test P < 0.0001). Camera-derived respiratory signal curves showed a higher SNR, lower standard deviation of the signal amplitude and less incorrect triggering than the respiratory belt-derived respiratory signal curves. CONCLUSION: Camera-based respiratory triggering significantly improves image quality of 3D-MRCP compared to conventional respiratory belt triggering.
Keywords:
Biliary tract; Diagnostic techniques and procedures; Magnetic resonance cholangiopancreatography; Magnetic resonance imaging; Pancreatic ducts
Authors: Thomas Sartoretti; Elisabeth Sartoretti; Árpád Schwenk; Luuk van Smoorenburg; Manoj Mannil; André Euler; Anton S Becker; Alex Alfieri; Arash Najafi; Christoph A Binkert; Michael Wyss; Sabine Sartoretti-Schefer Journal: PLoS One Date: 2020-04-29 Impact factor: 3.240