On the direct acquisition of beam's-eye-view images in MRI for integration with external beam radiotherapy

Physics in Medicine and Biology
K WachowiczB G Fallone

Abstract

The recent interest in the integration of external beam radiotherapy with a magnetic resonance (MR) imaging unit offers the potential for real-time adaptive tumour tracking during radiation treatment. The tracking of large tumours which follow a rapid trajectory may best be served by the generation of a projection image from the perspective of the beam source, or 'beam's eye view' (BEV). This type of image projection represents the path of the radiation beam, thus enabling rapid compensations for target translations, rotations and deformations, as well time-dependent critical structure avoidance. MR units have been traditionally incapable of this type of imaging except through lengthy 3D acquisitions and ray tracing procedures. This work investigates some changes to the traditional MR scanner architecture that would permit the direct acquisition of a BEV image suitable for integration with external beam radiotherapy. Based on the theory presented in this work, a phantom was imaged with nonlinear encoding-gradient field patterns to demonstrate the technique. The phantom was constructed with agarose gel tubes spaced two cm apart at their base and oriented to converge towards an imaginary beam source 100 cm away. A corresponding v...Continue Reading

References

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Nov 23, 2017·The British Journal of Radiology·David H ThomasDaniel Low

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Citations

May 7, 2020·Radiation Oncology·Christopher KurzMarco Riboldi
Dec 13, 2019·Scientific Reports·Bernhard StimpelAndreas Maier

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