Overview on radiation physics for medical physicists pdf physics aspects in SSRT and MRT. Very small field dosimetry in micron sized beams. Different approaches in 3D high resolution dosimetry for small fields. Monte Carlo calculations for MRT and SSRT.
Radiochromic film dosimety, PRESAGE 3D dosimetry and SI-based multiple strip detector systems in MRT. Although the techniques differ by their principles, SSRT and MRT share certain common aspects with the possibility of combining their advantages in the future. For MRT, the technique uses highly collimated, quasi-parallel arrays of X-ray microbeams between 50 and 600 keV. Important features of highly brilliant Synchrotron sources are a very small beam divergence and an extremely high dose rate. Peak entrance doses of several hundreds of Gy are extremely well tolerated by normal tissues and at the same time provide a higher therapeutic index for various tumor models in rodents. The hypothesis of a selective radio-vulnerability of the tumor vasculature versus normal blood vessels by MRT was recently more solidified.
Z elements in tumors followed by stereotactic irradiation with 80 keV photons to enhance the dose deposition only within the tumor. With SSRT already in its clinical trial stage at the ESRF, most medical physics problems are already solved and the implemented solutions are briefly described, while the medical physics aspects in MRT will be discussed in more detail in this paper. This article is about the field of science. The stars and planets were often a target of worship, believed to represent their gods.
While the explanations for these phenomena were often unscientific and lacking in evidence, these early observations laid the foundation for later astronomy. Ibn al-Haytham, in which he was not only the first to disprove the ancient Greek idea about vision, but also came up with a new theory. Using dissections and the knowledge of previous scholars, he was able to begin to explain how light enters the eye. He asserted that the light ray is focused, but the actual explanation of how light projected to the back of the eye had to wait until 1604. East and the West, for more than 600 years. Indeed, the influence of Ibn al-Haytham’s Optics ranks alongside that of Newton’s work of the same title, published 700 years later.