UWB Radar Tumor Tracking During Radiation Therapy

The patent replaces mechanical imaging systems (MRI, CT) with an electromagnetic radar-based detection system. The UWB radar system uses electromagnetic wave reflection and time-of-flight measurements to track tumor position, eliminating the need for complex mechanical imaging equipment while enabling real-time monitoring during radiation therapy.

The patent introduces an intermediary approach by using external surrogates (fiducial markers) and ultrasound probes as mediators between the imaging system and the tumor. However, it ultimately replaces these with direct electromagnetic detection that can penetrate lung tissue, eliminating the need for physical intermediaries that limit real-time capability or require invasive procedures.

The patent converts the harmful effect of electromagnetic radiation by using ultra-wideband frequencies that are non-ionizing. Instead of using ionizing x-rays that damage tissue, the system employs UWB electromagnetic waves that can penetrate lung tissue without causing radiation damage, thus converting a potentially harmful approach into a safe one while maintaining monitoring precision.

The patent changes the frequency parameter of the electromagnetic radiation from ionizing x-ray frequencies to non-ionizing UWB frequencies (3.1-10.6 GHz). This parameter change allows the system to maintain the ability to detect tumor position through electromagnetic interaction while eliminating the harmful ionizing effects that would accumulate with repeated measurements.

The patent implements a self-service system where the UWB radar automatically detects and tracks the tumor position without requiring operator intervention. The system performs real-time monitoring autonomously, eliminating the need for skilled operators to manually operate ultrasound probes and interpret images, thus making the process both simpler and more consistent.

The patent replaces the human operator as an intermediary with an automated electronic detection system. Instead of requiring a skilled operator to interpret ultrasound images in real-time, the UWB radar system automatically processes the electromagnetic signals to determine tumor position, removing the bottleneck of operator skill and availability.

The patent implements a feedback system where the UWB radar continuously monitors tumor position during radiation therapy and provides real-time information about tumor motion. This feedback allows the radiation delivery system to adjust beam positioning dynamically, ensuring accurate targeting without requiring a large fixed margin, thus protecting normal tissues while maintaining reliable tumor treatment.

The patent transitions from a static approach (fixed treatment margins based on preoperative imaging) to a dynamic approach where tumor position is continuously tracked and radiation delivery is adjusted in real-time. This dynamic adaptation allows the system to follow the tumor's motion with respiration, maintaining accurate targeting without exposing static normal tissues to unnecessary radiation doses.