Dosage estimation for conformation radiotherapy applied to cervical cancer was discussed. Field size and shape in conformation therapy was freely change able according to the shape and size of tumor. When the same size and shape of the field for therapy by Co 60 gamma ray was applied to each case, tissue-air ratio TAR was given by an equation, T=-0.00326d+1.035, where T is TAR and d an average ...

The design of a rail-to-rail micropower comparator in CMOS technology is described. The circuit is intended for implantable biomedical devices powered by batteries, with a total consumption of 500nA and operation up to supply voltages of 2V. This cell, currently being fabricated, has a core die area of 0.27 mm2 on a 2.4###m standard analog CMOS technology with a 0.85V nominal threshold voltage....

To evaluate the utility of Dynalog file information for planar dose verification in IMRT QA, a program is developed to convert Dynalog file data to DMLC field files. For this study, five predefined fluencies are planned and delivered using Varian, Eclipse 3D planning system and 6MV photon beam of Varian, Clinac DMX linear accelerator. To measure planar dose distribution, Kodak, EDR2 films are e...

introduction: scatter radiation is one of the major sources of error in nuclear medicine data processing. different methods of scatter correction have been introduced in order to improve the quality of data. however the best method is to avoid recording of scatter photons in acquisition. the only difference between scattered and non-scattered photons is the energy. pulse height analyzer is the ...

A stress procedure for reliability screening, SHOrt Voltage Elevation (SHOVE) test, is analyzed here. During SHOVE, test vectors are run at higher-than-normal supply voltage for a short period. Functional tests and IDDQ tests are then performed at the normal voltage. This procedure is effective in screening oxide thinning, which occurs when the oxide thickness of a transistor is less than expec...

The indistinguishability of independent single photons is presented by decomposing the single photon pulse into the mixed state of different transform-limited pulses. The entanglement between single photons and outer environment or other photons induces the distribution of the center frequencies of those transform-limited pulses and makes photons distinguishable. Only the single photons with th...