Regional myocardial function is most commonly evaluated subjectively using multiphase cine reconstructions with 0.5- to 2-mm reconstruction width and increment. Left ventricular myocardial motion should be segmentally evaluated in accordance with the American Heart Association 17-segment model of the myocardi...
Ultraviolet dosage is measured in “microwatt seconds per square centimeter”. In essence those units mean that the higher the microwatt level, the higher the dosage. Or the longer the exposure time, the higher the dosage. Finally, the greater the exposed area, the higher the dosage. For your...
the effect it has on human tissue, which is measured in sieverts, abbreviated as Sv. As 1 sievert represents a very large dose the following smaller units are commonly used; Millisieverts, one thousandth of a sievert and abbreviated as mSv (1000mSv = 1Sv) Or Microsieverts, one milliont...
In considering the harmful effects of ionizing radiation it is convenient to distinguish between two types of exposure: (1) a single, accidental exposure to a high dose of radiation during a short period of time, which is commonly referred to asacuteexposure, and which produces biological effects...
When we talk about the amount ofradiationneeded to trigger a certain set of radiation sickness symptoms, we're not talking in terms of absolute amounts. Instead, we're talking about the total dosage. This dosage takes a number of factors into account, including the intensity of the radiation...
Adjuvant radiation therapy to the parotid bed is commonly administered following surgical resection using either a pair of angled wedged photon beams or an ipsilateral mixed-beam portal of electrons and photons. The present study seeks to determine the optimal parotid bed treatment technique in the ...
Radiation can produce both acute and chronic damage to the lung, manifesting as acuteradiation pneumonitisand chronic progressivefibrosis, respectively.119The effect is dependent on radiation dosage, total time of irradiation, and tissue volume irradiated. Concomitant chemotherapy and infections, which in ...
Nevertheless, the Rayleigh model has a limited range of validity, which is usually related to the particle radius (commonly nanometric) and the wavelength of the radiation (generally in the visible range) [45]. The characteristic absorption of a material is determined by its composition, i.e.,...
measured quantities of radioactive material (most commonly radioactive isotopes of iridium, iodine or cesium) are placed within the conduits (commonly termed, "afterloading") and maintained in place for a selected period of time. When the therapy session is completed, the radioactive material is ...
measured. As such, the radiation dosimeter of the present invention is more convenient to use than current dosimeters employing radiochromic dyes while maintaining the accuracy and reliability of current dosimeters in making radiation dose determinations. Further, microencapsulation of radiochromic dyes ...