Dose profile variation with voltage in head CT scans using radiochromic films

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“…The four peripheral openings are 90° out of phase, the center of which is 10 mm from the phantom edge. In analogy to the display of an analog clock, peripheral openings were named 3, 6, 9 and 12, according to position within the gantry during the scanning of the central slice [2,8]. In relation to anatomical structures, positions 3 and 9 correspond to the axillary regions.…”

“…In order to obtain the weighted index (C k,w ) it was used the equation 1 and to obtain the volumetric index (C k,vol ) it was used the equation 2. Dose values were obtained using the conversion factors of PMMA and air according with the voltage (1.042 and 1.045) [1,2,17,18]. It has done the irradiation of the central slice of the Figure 4, in the oblong phantom is 5.8% smaller for the 120 kV protocol, and 5.1% for the 135 kV.…”

“…in radio diagnostic services present wide technological variations. Thus, images generated with the same diagnostic objective in different devices can generate different doses in patient, very different, either by the technological difference or the acquisition protocol used [1,2].…”

“…The ionizing radiation originated from the X-rays used for diagnosis is the artificial source that contributes most to the exposure dose of the population due to the large number of X-ray examinations performed per year. Computed Tomography tests are the radio diagnostic examination that contributes most to the dose increase in the population [2,3].…”

Analisis Pengaruh Kuat Arus dan Tegangan Terhadap Kualitas Citra Computed Tomography (CT) Scan Siemens Perspective di RSUP Dr. M. Djamil Padang

“…Mourão dkk. [7], melakukan pengukuran profil dosis pada pesawat CT Scan. Mereka telah melakukan pengukuran profil dosis pada CT Scan Toshiba Aquilion dengan menggunakan detektor film Strip Gafchromic XR.…”