Imaging tumour motion for radiotherapy planning using MRI.

Area of Science:

• Medical Imaging
• Radiotherapy
• Pulmonary Medicine

Background:

• Dynamic magnetic resonance imaging (MRI) enables visualization of lung motion and tumor mobility during respiration.
• Accurate assessment of lung tumor movement is crucial for precise radiotherapy planning, especially with advanced techniques.

Purpose of the Study:

• To describe recent advancements in analyzing and visualizing pulmonary nodules during continuous respiration using MRI.
• To present novel three-dimensional (3D) techniques alongside existing two-dimensional (2D) dynamic approaches for quantifying nodule motion.

Main Methods:

• Utilizing novel dynamic MRI technology for real-time imaging of lung and pulmonary nodule motion.
• Applying both 2D and novel 3D dynamic MRI techniques to quantify respiratory-induced tumor movement.
• Correlating MRI findings with pulmonary function tests (PFTs) and assessing regional lung differences.

Main Results:

• Dynamic MRI successfully visualizes lung tumor mobility during continuous respiration.
• MRI findings correlate well with pulmonary function tests, providing regional lung information.
• The technology can differentiate between tumor-bearing and non-tumor-bearing lung regions, assessing radiotherapy effects and compensatory mechanisms.

Conclusions:

• Dynamic MRI is a feasible and beneficial technology for radiotherapy planning of lung tumors.
• Novel 2D and 3D MRI techniques provide quantitative analysis of pulmonary nodule motion.
• MRI offers valuable regional insights into lung function, radiotherapy impacts, and compensatory changes.