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UNIT 4 RADIOLOGY
X-RAY PRODUCTION
Question | Answer |
---|---|
WHAT MATERIAL IS USED FOR THE FILAMENT? | Coiled thin wires made out of metal tungsten |
DESCRIBE THE FOCAL SPOT: | Part of the focal track - the actual area on the target where the electrons strike to produce xrays |
WHAT IS 1 MAIN ADVANTAGE OF USING THE FOCAL SPOT AS TO USING THE LARGE FOCAL SPOT? | Produces a finer image detail |
DESCRIBE THE ANODE-HEEL EFFECT AND GIVE AN EXAMPLE OF HOW TO USE IT FOR DENSITY | UNEVEN DISTRIBUTION OF RADIATION INTENSITY = WHEN XRAYS ON A BODY PART THAT IS UNEVEN, PUT THE THICKEST PART UNDER THE CATHODE |
DEFINE mA: | (MILLIAMPERES) THE UNIT OF MEASUREMENT FOR XRAY TUBE CURRENT |
DEFINE kVp | (KILOVOLTAGE PEAK) THE VOLTAGE (POTENTIAL DIFFERENCE) APPLIED ACROSS THE XRAY TUBE NEEDED TO MOVE THE ELETRONS FROM THE CATHODE TO ANODE. THE kVp controls the QUALITY OF XRAY PRODUCED |
DEFINE EXPOSURE TIME | Refers to the length of time tha the xray beam is on. Exposure time is measured in seconds (sec) |
WHAT IS THE MINIMUM AMOUNT OF ALUMINUM FILTRATION IN XRAY EQUIPMENT | 2.5 mm AL Equiv of filtration as a safety feature. |
WHAT ARE THE THREE MAIN PARTS OF THE XRAY TUBE | 1) THE GLASS ENVELOPE 2) THE CATHODE 3) THE ANODE |