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Article ; Online: Low-rank inversion reconstruction for through-plane accelerated radial MR fingerprinting applied to relaxometry at 0.35 T.

Mickevicius, Nikolai J / Glide-Hurst, Carri K

2022 Volume 88, Issue 2, Page(s) 840–848

Abstract: ... are not applicable to MRF acquisitions, wherein a single k-space spoke is acquired per frame ... differences between T: Conclusions: Through-plane accelerated MRF with radial k-space coverage was ...

Abstract	Purpose: To reduce scan time, methods to accelerate phase-encoded/non-Cartesian MR fingerprinting (MRF) acquisitions for variable density spiral acquisitions have recently been developed. These methods are not applicable to MRF acquisitions, wherein a single k-space spoke is acquired per frame. Therefore, we propose a low-rank inversion method to resolve MRF contrast dynamics from through-plane accelerated Cartesian/radial measurements applied to quantitative relaxation-time mapping on a 0.35T system. Methods: An algorithm was implemented to reconstruct through-plane aliased low-rank images describing the contrast dynamics occurring because of the transient-state MRF acquisition. T Results: No significant differences between T Conclusions: Through-plane accelerated MRF with radial k-space coverage was demonstrated at a low field strength of 0.35 T. This method enabled 3D T
MeSH term(s)	Algorithms ; Brain/diagnostic imaging ; Humans ; Image Processing, Computer-Assisted/methods ; Magnetic Resonance Imaging/methods ; Male ; Phantoms, Imaging
Language	English
Publishing date	2022-04-10
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	605774-3
ISSN	1522-2594 ; 0740-3194
ISSN (online)	1522-2594
ISSN	0740-3194
DOI	10.1002/mrm.29244
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Article: Transcatheter Arterial Chemoembolization Imaging Features in MR-Linac Radiation Therapy Planning for the Liver.

Crosby, Jennie / Bassetti, Michael F / Hurst, Newton J / Kruser, Tera / Glide-Hurst, Carri K

Cureus

2023 Volume 15, Issue 12, Page(s) e50459

Abstract: For MR-guided radiation therapy treatment planning, an MRI and CT of the intended treatment site are typically acquired. Patients' prior treatments or procedures can cause image artifacts in one or both scans, which may impact treatment planning or the ... ...

Abstract	For MR-guided radiation therapy treatment planning, an MRI and CT of the intended treatment site are typically acquired. Patients' prior treatments or procedures can cause image artifacts in one or both scans, which may impact treatment planning or the radiation dose calculation. In this case report, a patient with several previous transcatheter arterial chemoembolization (TACE) procedures was planned for radiation therapy on a low-field MR-linac, and the impact of residual iodinated oil on the radiation dose calculation and MR-guided adaptive workflow was evaluated.
Language	English
Publishing date	2023-12-13
Publishing country	United States
Document type	Case Reports
ZDB-ID	2747273-5
ISSN	2168-8184
ISSN	2168-8184
DOI	10.7759/cureus.50459
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Article ; Online: Multi-parametric MRI for radiotherapy simulation.

Li, Tian / Wang, Jihong / Yang, Yingli / Glide-Hurst, Carri K / Wen, Ning / Cai, Jing

Medical physics

2023 Volume 50, Issue 8, Page(s) 5273–5293

Abstract: Magnetic resonance imaging (MRI) has become an important imaging modality in the field of radiotherapy (RT) in the past decade, especially with the development of various novel MRI and image-guidance techniques. In this review article, we will describe ... ...

Abstract	Magnetic resonance imaging (MRI) has become an important imaging modality in the field of radiotherapy (RT) in the past decade, especially with the development of various novel MRI and image-guidance techniques. In this review article, we will describe recent developments and discuss the applications of multi-parametric MRI (mpMRI) in RT simulation. In this review, mpMRI refers to a general and loose definition which includes various multi-contrast MRI techniques. Specifically, we will focus on the implementation, challenges, and future directions of mpMRI techniques for RT simulation.
MeSH term(s)	Magnetic Resonance Imaging/methods ; Radiotherapy
Language	English
Publishing date	2023-02-09
Publishing country	United States
Document type	Journal Article ; Review
ZDB-ID	188780-4
ISSN	2473-4209 ; 0094-2405
ISSN (online)	2473-4209
ISSN	0094-2405
DOI	10.1002/mp.16256
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Article: Attention-Guided Generative Adversarial Network to Address Atypical Anatomy in Synthetic CT Generation.

Emami, Hajar / Dong, Ming / Glide-Hurst, Carri K

2020 IEEE 21st International Conference on Information Reuse and Integration for Data Science : IRI 2020 : proceedings : virtual conference, 11-13 August 2020. IEEE International Conference on Information Reuse and Integration (21st : 2...

2020 Volume 2020, Page(s) 188–193

Abstract: Recently, interest in MR-only treatment planning using synthetic CTs (synCTs) has grown rapidly in radiation therapy. However, developing class solutions for medical images that contain atypical anatomy remains a major limitation. In this paper, we ... ...

Abstract	Recently, interest in MR-only treatment planning using synthetic CTs (synCTs) has grown rapidly in radiation therapy. However, developing class solutions for medical images that contain atypical anatomy remains a major limitation. In this paper, we propose a novel spatial attention-guided generative adversarial network (attention-GAN) model to generate accurate synCTs using T1-weighted MRI images as the input to address atypical anatomy. Experimental results on fifteen brain cancer patients show that attention-GAN outperformed existing synCT models and achieved an average MAE of 85.223±12.08, 232.41±60.86, 246.38±42.67 Hounsfield units between synCT and CT-SIM across the entire head, bone and air regions, respectively. Qualitative analysis shows that attention-GAN has the ability to use spatially focused areas to better handle outliers, areas with complex anatomy or post-surgical regions, and thus offer strong potential for supporting near real-time MR-only treatment planning.
Language	English
Publishing date	2020-09-10
Publishing country	United States
Document type	Journal Article
DOI	10.1109/iri49571.2020.00034
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Article: Application of Continuous Positive Airway Pressure for Thoracic Respiratory Motion Management: An Assessment in a Magnetic Resonance Imaging-Guided Radiation Therapy Environment.

Liang, Evan / Dolan, Jennifer L / Morris, Eric D / Vono, Jonathan / Bazan, Luisa F / Lu, Mei / Glide-Hurst, Carri K

Advances in radiation oncology

2022 Volume 7, Issue 3, Page(s) 100889

Abstract: Purpose: Patient tolerability of magnetic resonance (MR)-guided radiation treatment delivery is limited by the need for repeated deep inspiratory breath holds (DIBHs). This volunteer study assessed the feasibility of continuous positive airway pressure ( ...

Abstract	Purpose: Patient tolerability of magnetic resonance (MR)-guided radiation treatment delivery is limited by the need for repeated deep inspiratory breath holds (DIBHs). This volunteer study assessed the feasibility of continuous positive airway pressure (CPAP) with and without DIBH for respiratory motion management during radiation treatment with an MR-linear accelerator (MR-linac). Methods and materials: MR imaging safety was first addressed by placing the CPAP device in an MR-safe closet and configuring a tube circuit via waveguide to the magnet bore. Reproducibility and linearity of the final configuration were assessed. Six healthy volunteers underwent thoracic imaging in a 0.35T MR-linac, with one free breathing (FB) and 2 DIBH acquisitions being obtained at 5 pressures from 0 to 15 cm-H Results: Compared with FB alone, FB-10, FB-12, and FB-15 cm H Conclusions: This work demonstrates the feasibility of integrating CPAP in an MR-linac environment in healthy volunteers. Extending this work to a larger patient cohort is warranted to further establish the role of CPAP as an alternative and concurrent approach to DIBH in MR-guided radiation therapy.
Language	English
Publishing date	2022-01-04
Publishing country	United States
Document type	Journal Article
ISSN	2452-1094
ISSN	2452-1094
DOI	10.1016/j.adro.2021.100889
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Book ; Online: Attention-Guided Generative Adversarial Network to Address Atypical Anatomy in Modality Transfer

Emami, Hajar / Dong, Ming / Glide-Hurst, Carri K.

2020

Abstract	Recently, interest in MR-only treatment planning using synthetic CTs (synCTs) has grown rapidly in radiation therapy. However, developing class solutions for medical images that contain atypical anatomy remains a major limitation. In this paper, we propose a novel spatial attention-guided generative adversarial network (attention-GAN) model to generate accurate synCTs using T1-weighted MRI images as the input to address atypical anatomy. Experimental results on fifteen brain cancer patients show that attention-GAN outperformed existing synCT models and achieved an average MAE of 85.22$\pm$12.08, 232.41$\pm$60.86, 246.38$\pm$42.67 Hounsfield units between synCT and CT-SIM across the entire head, bone and air regions, respectively. Qualitative analysis shows that attention-GAN has the ability to use spatially focused areas to better handle outliers, areas with complex anatomy or post-surgical regions, and thus offer strong potential for supporting near real-time MR-only treatment planning. Comment: IEEE 21st International Conference on Information Reuse and Integration for Data Science
Keywords	Electrical Engineering and Systems Science - Image and Video Processing ; Computer Science - Computer Vision and Pattern Recognition
Subject code	004
Publishing date	2020-06-26
Publishing country	us
Document type	Book ; Online
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Article ; Online: Experimental determination of magnetic field quality conversion factors for eleven ionization chambers in 1.5 T and 0.35 T MR-linac systems.

Orlando, Nathan / Crosby, Jennie / Glide-Hurst, Carri / Culberson, Wesley / Keller, Brian / Sarfehnia, Arman

Medical physics

2023 Volume 51, Issue 4, Page(s) 2998–3009

Abstract: ... a magnetic field quality conversion factor k: Purpose: The purpose of this study is to experimentally measure k ... to measure k: Results: Measured k: Conclusions: For a high-field MR-linac, the characterization ... a critical step toward accurate output calibration for MR-guided radiotherapy systems and the measured k ...

Abstract	Background: The static magnetic field present in magnetic resonance (MR)-guided radiotherapy systems can influence dose deposition and charged particle collection in air-filled ionization chambers. Thus, accurately quantifying the effect of the magnetic field on ionization chamber response is critical for output calibration. Formalisms for reference dosimetry in a magnetic field have been proposed, whereby a magnetic field quality conversion factor k Purpose: The purpose of this study is to experimentally measure k Methods: Eleven ionization chamber models were characterized in this study: Exradin A12, A12S, A28, and A26, PTW T31010, T31021, and T31022, and IBA FC23-C, CC25, CC13, and CC08. The experimental method to measure k Results: Measured k Conclusions: For a high-field MR-linac, the characterization of ionization chamber performance as angular orientation varied relative to the magnetic field confirmed that the ideal orientation for output calibration is parallel. For most of these chamber models, this study represents the first experimental characterization of chamber performance in clinical MR-linac beams. This is a critical step toward accurate output calibration for MR-guided radiotherapy systems and the measured k
MeSH term(s)	Radiometry ; Radiotherapy, Image-Guided ; Relative Biological Effectiveness ; Magnetic Fields ; Monte Carlo Method ; Water
Chemical Substances	Water (059QF0KO0R)
Language	English
Publishing date	2023-12-07
Publishing country	United States
Document type	Journal Article
ZDB-ID	188780-4
ISSN	2473-4209 ; 0094-2405
ISSN (online)	2473-4209
ISSN	0094-2405
DOI	10.1002/mp.16858
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Article ; Online: Incorporating sensitive cardiac substructure sparing into radiation therapy planning.

Morris, Eric D / Aldridge, Kate / Ghanem, Ahmed I / Zhu, Simeng / Glide-Hurst, Carri K

Journal of applied clinical medical physics

2020 Volume 21, Issue 11, Page(s) 195–204

Abstract: Purpose: Rising evidence suggests that cardiac substructures are highly radiosensitive. However, they are not routinely considered in treatment planning as they are not readily visualized on treatment planning CTs (TPCTs). This work integrated the soft ... ...

Abstract	Purpose: Rising evidence suggests that cardiac substructures are highly radiosensitive. However, they are not routinely considered in treatment planning as they are not readily visualized on treatment planning CTs (TPCTs). This work integrated the soft tissue contrast provided by low-field MRIs acquired on an MR-linac via image registration to further enable cardiac substructure sparing on TPCTs. Methods: Sixteen upper thoracic patients treated at various breathing states (7 end-exhalation, 7 end-inhalation, 2 free-breathing) on a 0.35T MR-linac were retrospectively evaluated. A hybrid MR/CT atlas and a deep learning three-dimensional (3D) U-Net propagated 13 substructures to TPCTs. Radiation oncologists revised contours using registered MRIs. Clinical treatment plans were re-optimized and evaluated for beam arrangement modifications to reduce substructure doses. Dosimetric assessment included mean and maximum (0.03cc) dose, left ventricular volume receiving 5Gy (LV-V5), and other clinical endpoints. As metrics of plan complexity, total MU and treatment time were evaluated between approaches. Results: Cardiac sparing plans reduced the mean heart dose (mean reduction 0.7 ± 0.6, range 0.1 to 2.5 Gy). Re-optimized plans reduced left anterior descending artery (LADA) mean and LADA Conclusions: By introducing 0.35T MRIs acquired on an MR-linac to verify cardiac substructure segmentations for CT-based treatment planning, an opportunity was presented for more effective sparing with limited increase in plan complexity. Validation in a larger cohort with appropriate margins offers potential to reduce radiation-related cardiotoxicities.
MeSH term(s)	Heart/diagnostic imaging ; Humans ; Organs at Risk ; Radiotherapy Dosage ; Radiotherapy Planning, Computer-Assisted ; Radiotherapy, Intensity-Modulated ; Retrospective Studies
Language	English
Publishing date	2020-10-18
Publishing country	United States
Document type	Journal Article
ZDB-ID	2010347-5
ISSN	1526-9914 ; 1526-9914
ISSN (online)	1526-9914
ISSN	1526-9914
DOI	10.1002/acm2.13037
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Article ; Online: Toward magnetic resonance fingerprinting for low-field MR-guided radiation therapy.

Mickevicius, Nikolai J / Kim, Joshua P / Zhao, Jiwei / Morris, Zachary S / Hurst, Newton J / Glide-Hurst, Carri K

Medical physics

2021 Volume 48, Issue 11, Page(s) 6930–6940

Abstract: Purpose: The acquisition of multiparametric quantitative magnetic resonance imaging (qMRI) is becoming increasingly important for functional characterization of cancer prior to- and throughout the course of radiation therapy. The feasibility of a qMRI ... ...

Abstract	Purpose: The acquisition of multiparametric quantitative magnetic resonance imaging (qMRI) is becoming increasingly important for functional characterization of cancer prior to- and throughout the course of radiation therapy. The feasibility of a qMRI method known as magnetic resonance fingerprinting (MRF) for rapid T Methods: A three-dimensional MRF sequence was implemented on a 0.35T MR-guided radiotherapy system. MRF-derived measurements of T Results: The phantom benchmarking studies showed that MRF is capable of mapping T Conclusions: The technical feasibility and accuracy of MRF on a low-field MR-guided radiation therapy device has been demonstrated. MRF can be used to measure accurate T
MeSH term(s)	Benchmarking ; Brain ; Humans ; Image Processing, Computer-Assisted ; Magnetic Resonance Imaging ; Magnetic Resonance Spectroscopy ; Phantoms, Imaging
Language	English
Publishing date	2021-09-18
Publishing country	United States
Document type	Journal Article
ZDB-ID	188780-4
ISSN	2473-4209 ; 0094-2405
ISSN (online)	2473-4209
ISSN	0094-2405
DOI	10.1002/mp.15202
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Article ; Online: MRI-only treatment planning: benefits and challenges.

Owrangi, Amir M / Greer, Peter B / Glide-Hurst, Carri K

Physics in medicine and biology

2018 Volume 63, Issue 5, Page(s) 05TR01

Abstract: Over the past decade, the application of magnetic resonance imaging (MRI) has increased, and there is growing evidence to suggest that improvements in the accuracy of target delineation in MRI-guided radiation therapy may improve clinical outcomes in a ... ...

Abstract	Over the past decade, the application of magnetic resonance imaging (MRI) has increased, and there is growing evidence to suggest that improvements in the accuracy of target delineation in MRI-guided radiation therapy may improve clinical outcomes in a variety of cancer types. However, some considerations should be recognized including patient motion during image acquisition and geometric accuracy of images. Moreover, MR-compatible immobilization devices need to be used when acquiring images in the treatment position while minimizing patient motion during the scan time. Finally, synthetic CT images (i.e. electron density maps) and digitally reconstructed radiograph images should be generated from MRI images for dose calculation and image guidance prior to treatment. A short review of the concepts and techniques that have been developed for implementation of MRI-only workflows in radiation therapy is provided in this document.
MeSH term(s)	Humans ; Magnetic Resonance Imaging/methods ; Neoplasms/pathology ; Neoplasms/radiotherapy ; Prognosis ; Radiotherapy Planning, Computer-Assisted/methods ; Radiotherapy, Image-Guided/methods
Language	English
Publishing date	2018-02-26
Publishing country	England
Document type	Journal Article ; Research Support, N.I.H., Extramural ; Review
ZDB-ID	208857-5
ISSN	1361-6560 ; 0031-9155
ISSN (online)	1361-6560
ISSN	0031-9155
DOI	10.1088/1361-6560/aaaca4
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