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Reduced Field-of-View Diffusion-Weighted Magnetic Resonance Imaging of the Pancreas: Comparison with Conventional Single-Shot Echo-Planar Imaging

OBJECTIVE: To investigate the image quality (IQ) and apparent diffusion coefficient (ADC) of reduced field-of-view (FOV) di-ffusion-weighted imaging (DWI) of pancreas in comparison with full FOV DWI. MATERIALS AND METHODS: In this retrospective study, 2 readers independently performed qualitative an...

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Autores principales: Kim, Hyungjin, Lee, Jeong Min, Yoon, Jeong Hee, Jang, Jin-Young, Kim, Sun-Whe, Ryu, Ji Kon, Kannengiesser, Stephan, Han, Joon Koo, Choi, Byung Ihn
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Korean Society of Radiology 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4644742/
https://www.ncbi.nlm.nih.gov/pubmed/26576110
http://dx.doi.org/10.3348/kjr.2015.16.6.1216
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author Kim, Hyungjin
Lee, Jeong Min
Yoon, Jeong Hee
Jang, Jin-Young
Kim, Sun-Whe
Ryu, Ji Kon
Kannengiesser, Stephan
Han, Joon Koo
Choi, Byung Ihn
author_facet Kim, Hyungjin
Lee, Jeong Min
Yoon, Jeong Hee
Jang, Jin-Young
Kim, Sun-Whe
Ryu, Ji Kon
Kannengiesser, Stephan
Han, Joon Koo
Choi, Byung Ihn
author_sort Kim, Hyungjin
collection PubMed
description OBJECTIVE: To investigate the image quality (IQ) and apparent diffusion coefficient (ADC) of reduced field-of-view (FOV) di-ffusion-weighted imaging (DWI) of pancreas in comparison with full FOV DWI. MATERIALS AND METHODS: In this retrospective study, 2 readers independently performed qualitative analysis of full FOV DWI (FOV, 38 × 38 cm; b-value, 0 and 500 s/mm(2)) and reduced FOV DWI (FOV, 28 × 8.5 cm; b-value, 0 and 400 s/mm(2)). Both procedures were conducted with a two-dimensional spatially selective radiofrequency excitation pulse, in 102 patients with benign or malignant pancreatic diseases (mean size, 27.5 ± 14.4 mm). The study parameters included 1) anatomic structure visualization, 2) lesion conspicuity, 3) artifacts, 4) IQ score, and 5) subjective clinical utility for confirming or excluding initially considered differential diagnosis on conventional imaging. Another reader performed quantitative ADC measurements of focal pancreatic lesions and parenchyma. Wilcoxon signed-rank test was used to compare qualitative scores and ADCs between DWI sequences. Mann Whitney U-test was used to compare ADCs between the lesions and parenchyma. RESULTS: On qualitative analysis, reduced FOV DWI showed better anatomic structure visualization (2.76 ± 0.79 at b = 0 s/mm(2) and 2.81 ± 0.64 at b = 400 s/mm(2)), lesion conspicuity (3.11 ± 0.99 at b = 0 s/mm(2) and 3.15 ± 0.79 at b = 400 s/mm(2)), IQ score (8.51 ± 2.05 at b = 0 s/mm(2) and 8.79 ± 1.60 at b = 400 s/mm(2)), and higher clinical utility (3.41 ± 0.64), as compared to full FOV DWI (anatomic structure, 2.18 ± 0.59 at b = 0 s/mm(2) and 2.56 ± 0.47 at b = 500 s/mm(2); lesion conspicuity, 2.55 ± 1.07 at b = 0 s/mm(2) and 2.89 ± 0.86 at b = 500 s/mm(2); IQ score, 7.13 ± 1.83 at b = 0 s/mm(2) and 8.17 ± 1.31 at b = 500 s/mm(2); clinical utility, 3.14 ± 0.70) (p < 0.05). Artifacts were significantly improved on reduced FOV DWI (2.65 ± 0.68) at b = 0 s/mm(2) (full FOV DWI, 2.41 ± 0.63) (p < 0.001). On quantitative analysis, there were no significant differences between the 2 DWI sequences in ADCs of various pancreatic lesions and parenchyma (p > 0.05). ADCs of adenocarcinomas (1.061 × 10(-3) mm(2)/s ± 0.133 at reduced FOV and 1.079 × 10(-3) mm(2)/s ± 0.135 at full FOV) and neuroendocrine tumors (0.983 × 10(-3) mm(2)/s ± 0.152 at reduced FOV and 1.004 × 10(-3) mm(2)/s ± 0.153 at full FOV) were significantly lower than those of parenchyma (1.191 × 10(-3) mm(2)/s ± 0.125 at reduced FOV and 1.218 × 10(-3) mm(2)/s ± 0.103 at full FOV) (p < 0.05). CONCLUSION: Reduced FOV DWI of the pancreas provides better overall IQ including better anatomic detail, lesion conspicuity and subjective clinical utility.
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spelling pubmed-46447422015-11-16 Reduced Field-of-View Diffusion-Weighted Magnetic Resonance Imaging of the Pancreas: Comparison with Conventional Single-Shot Echo-Planar Imaging Kim, Hyungjin Lee, Jeong Min Yoon, Jeong Hee Jang, Jin-Young Kim, Sun-Whe Ryu, Ji Kon Kannengiesser, Stephan Han, Joon Koo Choi, Byung Ihn Korean J Radiol Gastrointestinal Imaging OBJECTIVE: To investigate the image quality (IQ) and apparent diffusion coefficient (ADC) of reduced field-of-view (FOV) di-ffusion-weighted imaging (DWI) of pancreas in comparison with full FOV DWI. MATERIALS AND METHODS: In this retrospective study, 2 readers independently performed qualitative analysis of full FOV DWI (FOV, 38 × 38 cm; b-value, 0 and 500 s/mm(2)) and reduced FOV DWI (FOV, 28 × 8.5 cm; b-value, 0 and 400 s/mm(2)). Both procedures were conducted with a two-dimensional spatially selective radiofrequency excitation pulse, in 102 patients with benign or malignant pancreatic diseases (mean size, 27.5 ± 14.4 mm). The study parameters included 1) anatomic structure visualization, 2) lesion conspicuity, 3) artifacts, 4) IQ score, and 5) subjective clinical utility for confirming or excluding initially considered differential diagnosis on conventional imaging. Another reader performed quantitative ADC measurements of focal pancreatic lesions and parenchyma. Wilcoxon signed-rank test was used to compare qualitative scores and ADCs between DWI sequences. Mann Whitney U-test was used to compare ADCs between the lesions and parenchyma. RESULTS: On qualitative analysis, reduced FOV DWI showed better anatomic structure visualization (2.76 ± 0.79 at b = 0 s/mm(2) and 2.81 ± 0.64 at b = 400 s/mm(2)), lesion conspicuity (3.11 ± 0.99 at b = 0 s/mm(2) and 3.15 ± 0.79 at b = 400 s/mm(2)), IQ score (8.51 ± 2.05 at b = 0 s/mm(2) and 8.79 ± 1.60 at b = 400 s/mm(2)), and higher clinical utility (3.41 ± 0.64), as compared to full FOV DWI (anatomic structure, 2.18 ± 0.59 at b = 0 s/mm(2) and 2.56 ± 0.47 at b = 500 s/mm(2); lesion conspicuity, 2.55 ± 1.07 at b = 0 s/mm(2) and 2.89 ± 0.86 at b = 500 s/mm(2); IQ score, 7.13 ± 1.83 at b = 0 s/mm(2) and 8.17 ± 1.31 at b = 500 s/mm(2); clinical utility, 3.14 ± 0.70) (p < 0.05). Artifacts were significantly improved on reduced FOV DWI (2.65 ± 0.68) at b = 0 s/mm(2) (full FOV DWI, 2.41 ± 0.63) (p < 0.001). On quantitative analysis, there were no significant differences between the 2 DWI sequences in ADCs of various pancreatic lesions and parenchyma (p > 0.05). ADCs of adenocarcinomas (1.061 × 10(-3) mm(2)/s ± 0.133 at reduced FOV and 1.079 × 10(-3) mm(2)/s ± 0.135 at full FOV) and neuroendocrine tumors (0.983 × 10(-3) mm(2)/s ± 0.152 at reduced FOV and 1.004 × 10(-3) mm(2)/s ± 0.153 at full FOV) were significantly lower than those of parenchyma (1.191 × 10(-3) mm(2)/s ± 0.125 at reduced FOV and 1.218 × 10(-3) mm(2)/s ± 0.103 at full FOV) (p < 0.05). CONCLUSION: Reduced FOV DWI of the pancreas provides better overall IQ including better anatomic detail, lesion conspicuity and subjective clinical utility. The Korean Society of Radiology 2015 2015-10-26 /pmc/articles/PMC4644742/ /pubmed/26576110 http://dx.doi.org/10.3348/kjr.2015.16.6.1216 Text en Copyright © 2015 The Korean Society of Radiology http://creativecommons.org/licenses/by-nc/3.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Gastrointestinal Imaging
Kim, Hyungjin
Lee, Jeong Min
Yoon, Jeong Hee
Jang, Jin-Young
Kim, Sun-Whe
Ryu, Ji Kon
Kannengiesser, Stephan
Han, Joon Koo
Choi, Byung Ihn
Reduced Field-of-View Diffusion-Weighted Magnetic Resonance Imaging of the Pancreas: Comparison with Conventional Single-Shot Echo-Planar Imaging
title Reduced Field-of-View Diffusion-Weighted Magnetic Resonance Imaging of the Pancreas: Comparison with Conventional Single-Shot Echo-Planar Imaging
title_full Reduced Field-of-View Diffusion-Weighted Magnetic Resonance Imaging of the Pancreas: Comparison with Conventional Single-Shot Echo-Planar Imaging
title_fullStr Reduced Field-of-View Diffusion-Weighted Magnetic Resonance Imaging of the Pancreas: Comparison with Conventional Single-Shot Echo-Planar Imaging
title_full_unstemmed Reduced Field-of-View Diffusion-Weighted Magnetic Resonance Imaging of the Pancreas: Comparison with Conventional Single-Shot Echo-Planar Imaging
title_short Reduced Field-of-View Diffusion-Weighted Magnetic Resonance Imaging of the Pancreas: Comparison with Conventional Single-Shot Echo-Planar Imaging
title_sort reduced field-of-view diffusion-weighted magnetic resonance imaging of the pancreas: comparison with conventional single-shot echo-planar imaging
topic Gastrointestinal Imaging
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4644742/
https://www.ncbi.nlm.nih.gov/pubmed/26576110
http://dx.doi.org/10.3348/kjr.2015.16.6.1216
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