Effect of radiation induced current on the quality of MR images in an integrated linac‐MR system

Burke, B; Wachowicz, Keith; Fallone, B. G.; Rathee, S

doi:10.1118/1.4752422

Cited by 20 publications

(25 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[12][13][14][15] Radiofrequency interference between the MRI and Linac has also been studied. 16,17 The various dosimetry changes caused by the magnetic fields are also described, including both transverse [18][19][20][21][22][23][24][25][26][27] and longitudinal magnetic fields. 22,[28][29][30] The performance of common radiation detectors in magnetic fields has also been investigated.…”

Section: Introductionmentioning

confidence: 99%

Proton beam deflection in MRI fields: Implications for MRI‐guided proton therapy

et al. 2015

View full text Add to dashboard Cite

For the first time, accurate magnetic and Monte Carlo modeling have been used to assess the transport of generic proton beams toward a 1 T split-bore MRI. Significant rotation is observed in the inline orientation, while more complex deflection and distortion are seen in the perpendicular orientation. The results of this study suggest that due to the complexity and energy-dependent nature of the magnetic deflection and distortion, the pencil beam scanning method will be the only choice for delivering a therapeutic proton beam inside a potential MRI-guided proton therapy system in either the inline or perpendicular orientation. Further to this, significant correction strategies will be required to account for the MRI fringe fields.

show abstract

Section: Introductionmentioning

confidence: 99%

Proton beam deflection in MRI fields: Implications for MRI‐guided proton therapy

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Corresponding values for larger DSV were 6.32 ± 0.32 μT/√kW and 6.46 ± 0.39 μT/√kW at 40 cm and 50 cm respectively. interference described to date [6,8,9]. During dynamic image acquisition we were unable to detect any statistical difference in signal with the radiation beam turned on in any of the tests.…”

Section: Resultsmentioning

confidence: 65%

Imaging performance of a dedicated radiation transparent RF coil on a 1.0 Tesla inline MRI-linac

et al. 2018

View full text Add to dashboard Cite

This work describes the first imaging studies on a 1.0 Tesla inline MRI-Linac using a dedicated transmit/receive RF body coil that has been designed to be completely radio transparent and provide optimum imaging performance over a large patient opening. A series of experiments was performed on the MRI-Linac to investigate the performance and imaging characteristics of a new dedicated volumetric RF coil: (1) numerical electromagnetic simulations were used to measure transmit efficiency in two patient positions; (2) image quality metrics of signal-to-noise ratio (SNR), ghosting and uniformity were assessed in a large diameter phantom with no radiation beam; (3) radiation induced effects were investigated in both the raw data (k-space) and image sequences acquired with simultaneous irradiation; (4) radiation dose was measured with and without image acquisition; (5) RF heating was studied using an MR-compatible fluoroptic thermometer and; (6) the in vivo image quality and versatility of the coil was demonstrated in normal healthy subjects for both supine and standing positions. Daily phantom measurements demonstrated excellent imaging performance with stable SNR over a period of 3 months (42.6 ± 0.9). Simultaneous irradiation produced no statistical change in image quality (p > 0.74) and no interference in raw data for a 20 × 20 cm radiation field. The coil was found to be efficient over large volumes and negligible RF heating was observed. Volunteer scans acquired in both supine and standing positions provided artefact free images with good anatomical visualisation. The first completely radio transparent RF coil for use on a 1.0 Tesla MRI-Linac has been described. There is no impact on either the imaging or dosimetry performance with a simultaneous radiation beam. The open design enables imaging and radiotherapy guidance in a variety of positons.

show abstract

“…This is in contrast to previous studies which have either shown no observable effect 10 or described a reduction in SNR attributed as being caused by induction in the copper conductor directly. 11 Our results show a large increase in background intensity, which does not occur when the linear accelerator is in operation and the MLC is closed, thereby showing that it is not extraneous noise from the accelerator (which is outside a RF cage). The elevation of noise has the potential to reduce overall SNR within the image but this is highly dependent on the RF coil setup.…”

Section: Discussionmentioning

confidence: 61%

Technical Note: Experimental results from a prototype high‐field inline MRI‐linac

et al. 2016

View full text Add to dashboard Cite

show abstract

Effect of radiation induced current on the quality of MR images in an integrated linac‐MR system

Cited by 20 publications

References 14 publications

Proton beam deflection in MRI fields: Implications for MRI‐guided proton therapy

Proton beam deflection in MRI fields: Implications for MRI‐guided proton therapy

Imaging performance of a dedicated radiation transparent RF coil on a 1.0 Tesla inline MRI-linac

Technical Note: Experimental results from a prototype high‐field inline MRI‐linac

Contact Info

Product

Resources

About