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MO‐D‐214‐01: 4D‐MRI for Radiation Therapy of Moving Tumors

Publication ,  Conference
Yin, F; Biederer, J; Cai, J; Parikh, P
Published in: Medical Physics
January 1, 2011

Four‐dimensional computed tomography (4D‐CT) has been widely used in radiation therapy for imaging moving tumors, especially in the thoracic regions. In other body sites such as the abdominal, 4D‐CT is limited due to its intrinsic low soft‐tissue contrast. Additional concern for 4D‐CT includes increased radiation dose to the patient since a 4D‐CT scan typically generates 10 times more data than a regular CT scan. On the other hand, magnetic resonance imaging (MRI) has excellent soft‐ tissue contrast and implies no known radiation hazard. 4D‐MRI can be used to improve the determination of patient specific tumor motion margin for radiation therapy, especially for the tumors in the abdominal regions where non‐contrast enhanced 4D‐CT has limitations. It can be applied for repeated or prolonged measurements covering multiple respiratory cycles to monitor individual changes in respiration frequency and depth. It is therefore desirable to develop 4D‐MRI techniques to address the problems associated with 4D‐CT. There are different approaches to develop the 4D‐MRI technique. The more frequently applied approach is based on repeated fast 3D MR pulse sequences and requires sophisticated hardware. Another approach is to retrospectively sort slice MR images acquired continuously throughout the volume based on respiratory phases. While both approaches have the promise of becoming useful imaging tools for tumor motion management in radiation therapy, they have their own pros and cons. For the first approach, its temporal resolution (∼0.7 frame/s) and spatial resolution (3–4 mm) are limited resulting in an overestimation of tumor size as the mass is volume averaged into many voxels during motion and an underestimation of lesion displacement. The second approach will require some type of respiratory surrogate (either external or internal) and is therefore subject to similar limitations as 4D‐CT. However, a simple but most robust approach for the delineation of tumor positions and trajectories during respiration is the averaging of multiple single slice MR acquisitions over time within a MIP‐display. This largely reduces the complexity of the technique and still provides sufficient information for the definition of motion adapted target volume definition which enhances the probability of its clinical application. Learning Objectives: 1. To discuss the need of 4D‐MRI technique for improving patient care in radiation therapy 2. To present the latest development of 4D‐MRI imaging techniques and their differences. 3. To discuss the application of 4D‐MRI in tumor motion management and treatment planning in radiation therapy. © 2011, American Association of Physicists in Medicine. All rights reserved.

Duke Scholars

Published In

Medical Physics

DOI

ISSN

0094-2405

Publication Date

January 1, 2011

Volume

38

Issue

6

Start / End Page

3714 / 3715

Related Subject Headings

  • Nuclear Medicine & Medical Imaging
  • 5105 Medical and biological physics
  • 4003 Biomedical engineering
  • 1112 Oncology and Carcinogenesis
  • 0903 Biomedical Engineering
  • 0299 Other Physical Sciences
 

Citation

APA
Chicago
ICMJE
MLA
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Yin, F., Biederer, J., Cai, J., & Parikh, P. (2011). MO‐D‐214‐01: 4D‐MRI for Radiation Therapy of Moving Tumors. In Medical Physics (Vol. 38, pp. 3714–3715). https://doi.org/10.1118/1.3612976
Yin, F., J. Biederer, J. Cai, and P. Parikh. “MO‐D‐214‐01: 4D‐MRI for Radiation Therapy of Moving Tumors.” In Medical Physics, 38:3714–15, 2011. https://doi.org/10.1118/1.3612976.
Yin F, Biederer J, Cai J, Parikh P. MO‐D‐214‐01: 4D‐MRI for Radiation Therapy of Moving Tumors. In: Medical Physics. 2011. p. 3714–5.
Yin, F., et al. “MO‐D‐214‐01: 4D‐MRI for Radiation Therapy of Moving Tumors.” Medical Physics, vol. 38, no. 6, 2011, pp. 3714–15. Scopus, doi:10.1118/1.3612976.
Yin F, Biederer J, Cai J, Parikh P. MO‐D‐214‐01: 4D‐MRI for Radiation Therapy of Moving Tumors. Medical Physics. 2011. p. 3714–3715.

Published In

Medical Physics

DOI

ISSN

0094-2405

Publication Date

January 1, 2011

Volume

38

Issue

6

Start / End Page

3714 / 3715

Related Subject Headings

  • Nuclear Medicine & Medical Imaging
  • 5105 Medical and biological physics
  • 4003 Biomedical engineering
  • 1112 Oncology and Carcinogenesis
  • 0903 Biomedical Engineering
  • 0299 Other Physical Sciences