Retrospective reconstruction of four-dimensional magnetic resonance from interleaved cine imaging - A comparative study with four-dimensional computed tomography in the lung.

Peteani, Giulia; Paganelli, Chiara; Giovannelli, Anna Chiara; Bachtiary, Barbara; Safai, Sairos; Rogers, Susanne; Pusterla, Orso; Riesterer, Oliver; Weber, Damien Charles; Lomax, Antony John; Baroni, Guido; Fattori, Giovanni (2024). Retrospective reconstruction of four-dimensional magnetic resonance from interleaved cine imaging - A comparative study with four-dimensional computed tomography in the lung. Physics and imaging in radiation oncology, 29, p. 100529. Elsevier 10.1016/j.phro.2023.100529

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BACKGROUND AND PURPOSE

Imaging of respiration-induced anatomical changes is essential to ensure high accuracy in radiotherapy of lung cancer. We expanded here on methods for retrospective reconstruction of time-resolved volumetric magnetic resonance (4DMR) of the thoracic region and benchmarked the results against 4D computed tomography (4DCT).

MATERIALS AND METHOD

MR data of six lung cancer patients were collected by interleaving cine-navigator images with 2D data frame images, acquired across the thorax. The data frame images have been stacked in volumes based on a similarity metric that considers the anatomical deformation of lungs, while addressing ambiguities in respiratory phase detection and interpolation of missing data. The resulting images were validated against cine-navigator images and compared to paired 4DCTs in terms of amplitude and period of motion, assessing differences in internal target volume (ITV) margin definition.

RESULTS

4DMR-based motion amplitude was on average within 1.8 mm of that measured in the corresponding 2D cine-navigator images. In our dataset, the 4DCT motion and the 4DMR median amplitude were always within 3.8 mm. The median period was generally close to CT references, although deviations up to 24 % have been observed. These changes were reflected in the ITV, which was generally larger for MRI than for 4DCT (up to 39.7 %).

CONCLUSIONS

The proposed algorithm for retrospective reconstruction of time-resolved volumetric MR provided quality anatomical images with high temporal resolution for motion modelling and treatment planning. The potential for imaging organ motion variability makes 4DMR a valuable complement to standard 4DCT imaging.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Haematology, Oncology, Infectious Diseases, Laboratory Medicine and Hospital Pharmacy (DOLS) > Clinic of Radiation Oncology

UniBE Contributor:

Weber, Damien Charles

Subjects:

600 Technology > 610 Medicine & health

ISSN:

2405-6316

Publisher:

Elsevier

Language:

English

Submitter:

Pubmed Import

Date Deposited:

22 Jan 2024 11:16

Last Modified:

30 Jun 2024 02:19

Publisher DOI:

10.1016/j.phro.2023.100529

PubMed ID:

38235286

Uncontrolled Keywords:

4DMR Lung cancer Organ motion Radiotherapy

BORIS DOI:

10.48350/191772

URI:

https://boris.unibe.ch/id/eprint/191772

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