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Radiological Investigation II: MRI and Ventilation Perfusion Scan01:30

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Magnetic Resonance Imaging (MRI) and Ventilation Perfusion Scans are two radiological investigations that offer detailed diagnostic images of the body, particularly lung structures.
MRI
MRI uses magnetic fields and radiofrequency signals to distinguish between normal and abnormal tissues. This technology provides a more detailed diagnostic image than CT scans, enabling it to characterize pulmonary nodules, stage bronchogenic carcinoma, and evaluate inflammatory activity in...
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Area of Science:

  • Radiation oncology
  • Medical imaging
  • Pulmonary function testing

Background:

  • Adaptive radiation therapy aims to minimize healthy lung irradiation using repeat lung ventilation imaging (VI).
  • Efficacy of adaptive ventilation guidance depends on interfraction (week-to-week) changes being more significant than intrafraction (pre/post-fraction) breathing variations.
  • The study investigates the relationship between interfraction and intrafraction ventilation changes in lung cancer patients.

Purpose of the Study:

  • To test the hypothesis that lung cancer patients exhibit larger interfraction ventilation changes compared to intrafraction changes.
  • To perform the first comparison of interfraction and intrafraction lung VI pairs using four-dimensional cone beam CT ventilation imaging (4D-CBCT VI).

Main Methods:

  • Analysis of 215 4D-CBCT scans from 19 locally advanced non-small cell lung cancer (LA-NSCLC) patients.
  • Comparison of 56 interfraction and 78 intrafraction VI pairs using voxelwise Spearman correlations, mean image differences, and gamma pass rates.
  • Deformable image registration and normalization to account for breathing effort differences.

Main Results:

  • Interfraction VI pairs showed significantly lower Spearman correlation (r̄=0.52) than intrafraction pairs (r̄=0.67, p=0.0002).
  • Mean absolute ventilation differences were larger for interfraction pairs (|ΔV̄|=0.42) than intrafraction pairs (|ΔV̄|=0.32, p < 10⁻¹⁵).
  • Gamma analysis revealed a significantly lower pass rate for interfraction VIs (69%) compared to intrafraction VIs (80%, p=0.0003).

Conclusions:

  • Interfraction ventilation changes are significantly larger than intrafraction changes in LA-NSCLC patients during radiation therapy.
  • Longitudinal ventilation changes are patient-dependent, supporting the use of adaptive ventilation guidance with repeat 4D-CBCT VIs.
  • Improvements in 4D-CBCT reconstruction algorithms are expected to enhance the resolution of interfraction ventilation changes.