hrvatski

Metoda za dobivanje slike HVL-a spektra rendgenskog zračenja

While performing diagnostic radiology procedures, stability and constancy of X-ray anode voltage are very important. Variations in kVp value changes X-ray beam's intensity and its penetrating power. Filters are commonly used in diagnostic radiology techniques to minimize a dose received by a patient without decreasing desired contrast of the diagnostic image. HVL &#8211 ; (Half Valuel Layer) is used as a measurable quality parameter for X-ray beams and it is defined as a value of absorber thickness, which will transmit one half of the incident intensity of the x-ray radiation output incident upon it. It is known that HVL depends proportionally on kVp value so detecting any changes in HVL for the same nominal X-ray tube kVp value will indicate the malfunctions of the X-ray generator. In this paper a simple method of HVL determination using set of aluminum step wedges is presented. The method enables very simple and precise HVL determination and it is capable of detecting variations in kVp value, which are less than 5% of the nominal value. Using this method while performing periodical testing of X-ray units with constant parameters (chosen kVp and mAs value) could provide frequent kVp value monitoring, determinating HVL changes, and controlling the beam intensity comparing X-ray films blackening from images taken with the same nominal parameters

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