The last 50 years have seen great advances in the accuracy of external beam radiation therapy. Geometrical uncertainties have been reduced from a centimeter or more in presimulation, skin-mark guided days to 1-2 mm in today's image-guided radiation therapy treatments. Medical physicists, with the support and guidance of the American Association of Physicists in Medicine (AAPM), have been, and continue to be, at the forefront of research, development and clinical implementation in this area. This article reviews some of the major contributions of physicists to the improvement of treatment accuracy and precision, and speculates as to what the future may bring.
We study the influence of outer Solar System architecture on the structural
Evolution of the Oort Cloud (OC) and the flux of Earth-crossing comets. In
Particular, we seek to quantify the role of the giant planets as "planetary
Protectors". To do so, we have run simulations in each of four different...
It is shown, by a semi-classical argument, that the Dirac charge quantization
is still valid in the (classical) Born-Infeld electromagnetic theory. Then it
is possible to calculate Dirac's monopole mass in the framework of this theory,
which is not possible in Maxwell's theory. The existence of an...
Self-consistent proton-neutron quasiparticle random phase approximation based
on the spherical nonlinear point-coupling relativistic Hartree-Bogoliubov
theory is established and used to investigate the $\beta^+$/EC-decay half-lives
of neutron-deficient Ar, Ca, Ti, Fe, Ni, Zn, Cd, and Sn isotopes. T...
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