Repeatability and reproducibility of ADC measurements and MRI signal intensity measurements of bone marrow in monoclonal plasma cell disorders: a prospective bi-institutional multiscanner, multiprotocol study
Background/Objectives: Apparent diffusion coefficient (ADC) and signal intensity (SI) measurements play an increasing role in magnetic resonance imaging (MRI) of monoclonal plasma cell disorders. The purpose of this study was to assess interrater variability, repeatability, and reproducibility of AD...
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| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
2022
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| In: |
Investigative radiology
Year: 2022, Volume: 57, Issue: 4, Pages: 272-281 |
| ISSN: | 1536-0210 |
| DOI: | 10.1097/RLI.0000000000000838 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1097/RLI.0000000000000838 Verlag, lizenzpflichtig, Volltext: https://journals.lww.com/investigativeradiology/Abstract/2022/04000/Repeatability_and_Reproducibility_of_ADC.8.aspx 
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| Author Notes: | Markus Wennmann, MD, Heidi Thierjung, MD, Fabian Bauer, Vivienn Weru, MSc, Thomas Hielscher, MSc, Martin Grözinger, MD, Regula Gnirs, Sandra Sauer, MD, Hartmut Goldschmidt, MD, Niels Weinhold, PhD, David Bonekamp, MD, Heinz-Peter Schlemmer, MD, PhD, Tim Frederik Weber, MD, Stefan Delorme, MD, Lukas Thomas Rotkopf, BSc |
MARC
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| 245 | 1 | 0 | |a Repeatability and reproducibility of ADC measurements and MRI signal intensity measurements of bone marrow in monoclonal plasma cell disorders |b a prospective bi-institutional multiscanner, multiprotocol study |c Markus Wennmann, MD, Heidi Thierjung, MD, Fabian Bauer, Vivienn Weru, MSc, Thomas Hielscher, MSc, Martin Grözinger, MD, Regula Gnirs, Sandra Sauer, MD, Hartmut Goldschmidt, MD, Niels Weinhold, PhD, David Bonekamp, MD, Heinz-Peter Schlemmer, MD, PhD, Tim Frederik Weber, MD, Stefan Delorme, MD, Lukas Thomas Rotkopf, BSc |
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| 500 | |a Received for publication July 31, 2021; and accepted for publication, after revision, September 7, 2021 | ||
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| 520 | |a Background/Objectives: Apparent diffusion coefficient (ADC) and signal intensity (SI) measurements play an increasing role in magnetic resonance imaging (MRI) of monoclonal plasma cell disorders. The purpose of this study was to assess interrater variability, repeatability, and reproducibility of ADC and SI measurements from bone marrow (BM) under variation of MRI protocols and scanners. Patients and Methods: Fifty-five patients with suspected or confirmed monoclonal plasma cell disorder were prospectively included in this institutional review board-approved study and underwent several measurements after the standard clinical whole-body MR scan, including repeated scan after repositioning, scan with a second MRI protocol, scan at a second 1.5 T scanner with a harmonized MRI protocol, and scan at a 3 T scanner. For T1-weighted, T2-weighted STIR, B800 images, and ADC maps, regions of interest were placed in the BM of the iliac crest and sacral bone, and in muscle tissue for image normalization. Bland-Altman plots were constructed, and absolute bias, relative bias to mean, limits of agreement, and coefficients of variation were calculated. Results: Interrater variability and repeatability experiments showed a maximal relative bias of −0.077 and a maximal coefficient of variation of 16.2% for all sequences. Although the deviations at the second 1.5 T scanner with harmonized MRI protocol to the first 1.5 T scanner showed a maximal relative bias of 0.124 for all sequences, the variation of the MRI protocol and scan at the 3 T scanner led to large relative biases of up to −0.357 and −0.526, respectively. When comparing the 3 T scanner to the 1.5 T scanner, normalization to muscle reduced the bias of T1-weighted and T2-weighted sequences, but not of ADC maps. Conclusions: The MRI scanners with identical field strength and harmonized MRI protocols can provide relatively stable quantitative measurements of BM ADC and SI. Deviations in MRI field strength and MRI protocol should be avoided when applying ADC cutoff values, which were established at other scanners or when performing multicentric imaging trials. | ||
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