Felix N Harder1, Omar Kamal2, Georgios A Kaissis3, Irina Heid1, Fabian K Lohöfer1, Sean McTavish1, Anh T Van1, Christoph Katemann4, Johannes M Peeters5, Dimitrios C Karampinos1, Marcus R Makowski1, Rickmer F Braren6. 1. Institute of Diagnostic and Interventional Radiology, Technical University of Munich, School of Medicine. 2. Institute of Diagnostic and Interventional Radiology, Technical University of Munich, School of Medicine; Department of Radiology, South Egypt Cancer Institute, Assiut University, Egypt. 3. Institute of Diagnostic and Interventional Radiology, Technical University of Munich, School of Medicine; Department of Computing, Faculty of Engineering, Imperial College of Science, Technology and Medicine, United Kingdom. 4. Philips Healthcare, Hamburg, Germany. 5. Philips Healthcare, Best, The Netherlands. 6. Institute of Diagnostic and Interventional Radiology, Technical University of Munich, School of Medicine. Electronic address: rbraren@tum.de.
Abstract
RATIONALE AND OBJECTIVES: To investigate the effects of a reduced field-of-view (rFOV) acquisition in diffusion-weighted magnetic resonance imaging of the pancreas. MATERIALS AND METHODS: We enrolled 153 patients who underwent routine clinical MRI work-up including respiratory-triggered diffusion-weighted single-shot echo-planar imaging (DWI) with full field-of-view (fFOV, 3 × 3 × 4 mm3 voxel size) and reduced field-of-view (rFOV, 2.5 × 2.5 × 3 mm3 voxel size) for suspected pancreatic pathology. Two experienced radiologists were asked to subjectively rate (Likert Scale 1-4) image quality (overall image quality, lesion conspicuity, anatomical detail, artifacts). In addition, quantitative image parameters were assessed (apparent diffusion coefficient, apparent signal to noise ratio, apparent contrast to noise ratio [CNR]). RESULTS: All subjective metrics of image quality were rated in favor of rFOV DWI images compared to fFOV DWI images with substantial-to-high inter-rater reliability. Calculated ADC values of normal pancreas, pancreatic pathologies and reference tissues revealed no differences between both sequences. Whereas the apparent signal to noise ratio was higher in fFOV images, apparent CNR was higher in rFOV images. CONCLUSION: rFOV DWI provides higher image quality and apparent CNR values, favorable in the analysis of pancreatic pathologies.
RATIONALE AND OBJECTIVES: To investigate the effects of a reduced field-of-view (rFOV) acquisition in diffusion-weighted magnetic resonance imaging of the pancreas. MATERIALS AND METHODS: We enrolled 153 patients who underwent routine clinical MRI work-up including respiratory-triggered diffusion-weighted single-shot echo-planar imaging (DWI) with full field-of-view (fFOV, 3 × 3 × 4 mm3 voxel size) and reduced field-of-view (rFOV, 2.5 × 2.5 × 3 mm3 voxel size) for suspected pancreatic pathology. Two experienced radiologists were asked to subjectively rate (Likert Scale 1-4) image quality (overall image quality, lesion conspicuity, anatomical detail, artifacts). In addition, quantitative image parameters were assessed (apparent diffusion coefficient, apparent signal to noise ratio, apparent contrast to noise ratio [CNR]). RESULTS: All subjective metrics of image quality were rated in favor of rFOV DWI images compared to fFOV DWI images with substantial-to-high inter-rater reliability. Calculated ADC values of normal pancreas, pancreatic pathologies and reference tissues revealed no differences between both sequences. Whereas the apparent signal to noise ratio was higher in fFOV images, apparent CNR was higher in rFOV images. CONCLUSION: rFOV DWI provides higher image quality and apparent CNR values, favorable in the analysis of pancreatic pathologies.
Authors: Felix N Harder; Eva Jung; Sean McTavish; Anh Tu Van; Kilian Weiss; Sebastian Ziegelmayer; Joshua Gawlitza; Philip Gouder; Omar Kamal; Marcus R Makowski; Fabian K Lohöfer; Dimitrios C Karampinos; Rickmer F Braren Journal: Cancers (Basel) Date: 2022-01-18 Impact factor: 6.639