Kilovoltage peak | 合法醫療器材資訊網

AlongwiththemAs(tubecurrentandexposuretimeproduct)andfiltration,kVp(​tubevoltage)isoneoftheprimarysettingsthatcanbeadjustedonx-ray ...

Kilovoltage peak (kVp) is the peak potential applied to the x-ray tube[1], which accelerates electrons from the cathode to the anode in radiography[2] or computed tomography[3]. Tube voltage, in turn, determines the quantity and quality[4] of the photons generated[5]. An increase in kVp extends and intensifies the x-ray emission spectrum, such that the maximal and average/effective energies are higher and the photon number/intensity is higher.

Along with the mAs[6] (tube current and exposure time product) and filtration[7], kVp (tube voltage) is one of the primary settings that can be adjusted on x-ray machines to control the image quality and patient dose.

The first consideration when selecting the kVp is ensuring adequate penetration and exposure 5,7, which depends on photon number, photon energy, and tissue attenua...