Herbert Pychlau invented a new measuring quantity based on the inverse square law, which he named the “Dose Area Product (DAP)”. The DAP is the product of the multiplication of the entrance dose and the area of the irradiated field. Doubling the distance increases the radiation area by factor four, while the dose decreases simultaneously by factor four. Both effects cancel out each other and therefore the new unit [Rcm2] was ideal for educational measurements as it is independent of the focus patient distance.
Today the DIAMENTOR is going stronger than ever before. It is a must in X-ray diagnostics worldwide, not only helping to reduce patient exposure, but also being an independent quality control tool, informing the operator about any deviation of the X-ray unit constancy. Since five decades the measuring principle is still the same while the PTW DIAMENTOR product portfolio of course changed: PTW Freiburg provides integrated, built-in, multi channel and combined dose and DAP DIAMENTOR solutions. Over the years PTW as pioneer of the DAP meter has delivered many thousands of reliable instruments to satisfied customers worldwide