Abstract
Purpose
To compare the abilities of turbo spin-echo diffusion-weighted imaging (TSE DWI) and multi-shot echo planar DWI (MSh DWI) to discriminate orbital lymphoma from inflammatory lesions.
Materials and methods
Twenty-nine patients with pathologically confirmed lymphomas and 39 patients with inflammation were imaged with a 3.0-T system. The apparent diffusion coefficient (ADC) of each lesion was measured. Signal intensities compared to normal grey matter on conventional imaging were also measured.
Results
The ADCs derived from the TSE DWI of the lymphomas (0.68 ± 0.14 × 10−3 mm2/s) were significantly lower than those of the inflammation cases (1.04 ± 0.39 × 10−3 mm2/s; p < 0.001). The ADCs derived from MSh DWI could not be used to separate the lymphomas from the inflammation (1.16 ± 0.43 × 10−3 mm2/s vs. 1.36 ± 0.48 × 10−3 mm2/s; p = 0.06). Conventional sequences also could not separate the lymphomas from the inflammation (p > 0.05). The ROC analysis showed the best diagnostic performance with ADCs derived from TSE DWI (the area under the curve: AUC = 0.831) followed by ADC derived from MSh DWI (AUC = 0.633).
Conclusion
The ADCs derived from TSE DWI might help to differentiate orbital lymphomas from inflammation.
Key Points
• ADC of lymphoma was significantly lower than that of inflammation.
• ADC derived from TSE DWI showed the best diagnostic performance.
• This study was conducted by a 3-T MR scanner.
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The scientific guarantor of this publication is Hiroshi Honda.
Conflict of interest
Mr. Atsushi Takemura declares relationships with the following companies: Philips Electronics, Japan. However, he was not involved in data analysis of this study.
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The authors state that this work was supported by JSPS KAKENHI Grant Numbers JP26461826 and 17K10408.
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Mr. Junji Kishimoto kindly provided statistical advice for this manuscript.
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Written informed consent was waived by the Institutional Review Board.
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Institutional Review Board approval was obtained.
Study subjects or cohorts overlap
Some study subjects or cohorts have been previously reported in ISMRM 2016.
Methodology
• retrospective
• observational
• performed at one institution
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Hiwatashi, A., Togao, O., Yamashita, K. et al. Diffusivity of intraorbital lymphoma vs. inflammation: comparison of single shot turbo spin echo and multishot echo planar imaging techniques. Eur Radiol 28, 325–330 (2018). https://doi.org/10.1007/s00330-017-4995-5
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DOI: https://doi.org/10.1007/s00330-017-4995-5