11-02-2020 AC and DC X-RAY Generators CONVENTIONAL AC GENERATORS The mains alternating current (50 Hz) is applied to a circuit (basically a step-up transformer) which elevates it from 230V to 70.000V (70kV). The high voltage (still at 50Hz) is applied to a rectifier circuit which: - Eliminates the negative portion of the waves (half wave rectifier), or - Converts the negative half-waves into positive (full wave rectifier) - The portion of wave useful for image formation is limited to the “crest” - All the rest doesn’t produce film blackening, but it is noxious for the patient HIGH FREQUENCY AND DC GENERATORS - The HF generator employs a specific circuitry (INVERTER) which generates a waveform of much higher frequency than the mains - Typical operating frequency of an HF generator is in the order of several tens of kilohertz (kHz) - A specific circuits “flattens” the crests of the waves to further increase the amount of useful radiation - Such almost flat waveform is called “constant potential”, or DC COMPARISON OF WAVEFORM DC GENERATOR If the ripple is smaller than 4%, the IEC standards allow to give the generator the “constant potential” or DC attribute HF TECHNOLOGY ADVANTAGES - Tubehead more compact and lighter, because the high voltage transformer is smaller - Patient dose reduced by 25%, because the “soft” X-ray portion is reduced - kV value can be lower (60 kV instead of 70) because the entire waveform is “useful” to produce image - Complete line voltage fluctuation insensibility - Exposure times shorter AC AND DC X-RAY GENERATORS 11-02-2020 CONVENTIONAL AC GENERATORS The mains alternating current (50 Hz) is applied to a circuit (basically a step-up transformer) which elevates it from 230V to 70.000V (70kV). The high voltage (still at 50Hz) is applied to a rectifier circuit wh... Pagina 1 di 1 1 COMPANY INFO De Götzen S.r.l. a socio unico Attività di direzione e coordinamento di Finapolline S.A.S. PEC: degotzen@pec.degotzen.net CF: 01321570127 P.IVA: 02541660128 CAPITALE SOCIALE: 7.170.000€ i.v. LINKS Work with us Privacy Policy Cookie Policy CONTACTS Address Via Roma, 45 - 21057 Olgiate Olona (VA) Italia Phones +39 0331 376760 +39 0331 376763 (FAX) Opening hours Mon-Fri: 08:00 - 18:00 de Götzen® 2021.