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KMID : 1151820110050050223
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Journal of the Korean Society of Radiology
2011 Volume.5 No. 5 p.223 ~ p.229
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Distribution of X-ray Strength in Exposure Field Caused by Heel Effect
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Jang Keun-Jo
Kim Nam-Hun
Lee Jun-Haeng
Lee Sang-Bock
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Abstract
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When negative electron in x-ray tube is accelerated in to a high speed and then the currency of the electron is blocked by the target, x-ray happens by the conversion of the energy. The real area where the fast accelerated electron collides to a target area is called actual focal spot. When the string focused size is observed at the central ray side, where the direction x-ray comes out, the size seems to be reduced. This focus is called effective focal spot. According to radiation angle of x-rays tube, the degree of the negative pole side presents higher value than inclination, the amount of exposed radiation that patient receives differs by the angle of positive pole, which means effective focal spot is the variable. This paper presents the correlation between size of effective focal spot and amount of exposed radiation to the patient by it, and effective research for homogenized dose dispersion by the size of effective focal spot. In conclusion, following the focal size, effective range which was -8cm ~ 0 cm on average, was found and average dose rate was 0.019 R/min. Through this range, for patients with small radiation exposure, image with good density and resolution in aspect of diagnosing will be able to be obtained.
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KEYWORD
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Focal Spot Test, Effective focal spot, Exposure Dose, Heel effect
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