Defect distribution index: A novel metric for functional lung MRI in cystic fibrosis.

Valk, Anne; Willers, Corin; Shahim, Kamal; Pusterla, Orso; Bauman, Grzegorz; Sandkühler, Robin; Bieri, Oliver; Wyler, Florian; Latzin, Philipp (2021). Defect distribution index: A novel metric for functional lung MRI in cystic fibrosis. Magnetic resonance in medicine, 86(6), pp. 3224-3235. Wiley-Liss 10.1002/mrm.28947

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PURPOSE

Lung impairment from functional MRI is frequently assessed as defect percentage. The defect distribution, however, is currently not quantified. The purpose of this work was to develop a novel measure that quantifies how clustered or scattered defects in functional lung MRI appear, and to evaluate it in pediatric cystic fibrosis.

THEORY

The defect distribution index (DDI) calculates a score for each lung voxel categorized as defected. The index increases according to how densely and how far an expanding circle around a defect voxel contains more than 50% defect voxels.

METHODS

Fractional ventilation and perfusion maps of 53 children with cystic fibrosis were previously acquired with matrix pencil decomposition MRI. In this work, the DDI is compared to a visual score of 3 raters who evaluated how clustered the lung defects appear. Further, spearman correlations between DDI and lung function parameters were determined.

RESULTS

The DDI strongly correlates with the visual scoring (r = 0.90 for ventilation; r = 0.88 for perfusion; P < .0001). Although correlations between DDI and defect percentage are moderate to strong (r = 0.61 for ventilation; r = 0.75 for perfusion; P < .0001), the DDI distinguishes between patients with comparable defect percentage.

CONCLUSION

The DDI is a novel measure for functional lung MRI. It provides complementary information to the defect percentage because the DDI assesses defect distribution rather than defect size. The DDI is applicable to matrix pencil MRI data of cystic fibrosis patients and shows very good agreement with human perception of defect distributions.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Gynaecology, Paediatrics and Endocrinology (DFKE) > Clinic of Paediatric Medicine
04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR) > Unit Childrens Hospital > Forschungsgruppe Pneumologie (Pädiatrie)
04 Faculty of Medicine > Department of Gynaecology, Paediatrics and Endocrinology (DFKE) > Clinic of Paediatric Medicine > Paediatric Pneumology

Graduate School:

Graduate School for Cellular and Biomedical Sciences (GCB)

UniBE Contributor:

Willers, Christoph Corin, Shahim, Kamal, Wyler, Florian, Latzin, Philipp

Subjects:

600 Technology > 610 Medicine & health

ISSN:

0740-3194

Publisher:

Wiley-Liss

Language:

English

Submitter:

Anette van Dorland

Date Deposited:

16 Sep 2021 11:11

Last Modified:

05 Dec 2022 15:53

Publisher DOI:

10.1002/mrm.28947

PubMed ID:

34337778

Uncontrolled Keywords:

MRI cystic fibrosis lung pediatrics quantification ventilation and perfusion

BORIS DOI:

10.48350/159013

URI:

https://boris.unibe.ch/id/eprint/159013

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