Radiation Therapy

Radiation Therapy Portfolios

Most Recent Patents

Minimally Invasive Microwave Ablation Antennas

UW–Madison researchers have developed two minimally invasive, balun-free antenna designs that are small enough to treat cancers otherwise out of the reach of microwave ablation.

The first design can take any base-fed monopole, spiral or bent wire configuration. Alternatively, the antenna can use a structure more suitable for higher frequencies (five GHz to 30 GHz). This design uses cable shielding over a balanced two-wire transmission line. The design protects surrounding tissue and eliminates the need for baluns.

Sharpening Filter for Orthovoltage Radiation

UW–Madison researchers have developed a compact filter that increases the sharpness of orthovoltage pencil beams and may be tailored to different beam sizes and focus depths.

The technology features a specially designed collimator and filter disk having concentric circular attenuation regions to produce the necessary sharpening effect. The flat design of the filter disk supports easy installation and replacement, and the concentric circular attenuation regions are amenable to computerized optimization of the region sizes and spacing.

Real-Time 3-D Elastography

The researchers have now developed an enhancement to their technique that works especially well with a 2-D ultrasound array to provide real-time 3-D imaging. The improvement derives from a new reconstruction scheme that uses sparse data.

The new scheme imposes two key requirements – interpolation and smoothing. Essentially, raw ultrasonic echo data is acquired over many imaging planes. Then, an efficient algorithm tracks frame to frame displacement of the underlying tissue at each pixel in the imaging plane. Mechanical properties such as strain can be estimated by a calculation along the ultrasound scan line direction. The 3-D reconstruction algorithm rapidly reconstructs a complete 3-D visualization from a sparse collection of scattered data points.