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Radiology
Stack #171402
Question | Answer |
---|---|
Who is the Father of X-rays? | Wilhem C. Roentgen |
Who was the first to Expose dental radiographs? | A. Walcoff |
What does PID stand for? | Positioning Indicating Device |
What does BID stand for? | Bisecting Indicating Device |
Name the 4 types of film? | pariapicals, bitewings, panoramic and cephalometric. |
Name the x-ray properties? | Invisible, travel straight lines.Speed of light,no mass or weight.No charge.Penetrate opaque tissue and structures.Affect photo film emulsion.Affect biological tissue. |
What are the two forms of ionization radiation? | Electro magnetic and particulate. |
Do we use Hard of Soft radiation? | Hard. |
What do AMPs control? | Quantity and Darkness |
What do Kvp's control? | Quality and Sharpness |
Where is the step down transformer located? | Cathode and AMPs |
Where is the step up transformer located? | Anode and Kvps |
What are the 3 conditions for an X-ray? | 1) source of free-electrons2) increase of voltage for spd. (kvp)3) target to stop electrons (Brems effect) |
What are the 5 rules of Shadow Casting? | 1)Small focal spot.2)long target-object distance3)short object-film distance4)Parallel relationship between object-film5)Perpendicular relationship between central ray and object |
When is the cell most susceptible to radiation injury? | During Mitosis |
What does the law of B & T state? | That actively dividing cells are more susceptible or sensitive than those that divide slowly. |
What is the most susceptible cell? | WBCs |
What is the least susceptible cell? | teeth |
Which is more susceptible, connective tissue or Brain Cells? | Connective tissue |
What did the Dose Response Curve lead to? | ALARA |
Name protective Measures for radiation? | 1. lead apron/thyroid collar2. collimator3. aluminum filter4. fast film5. proper safety techniques |
When exposed, how much of the body recovers within 24 hours. | 75% |
What does LD 50/30 mean? | Kill 50% of population within 30 days |
What does ARS mean? | Acute radiation syndrome |
What is the purpose of the collimator and what size is it? | To reduce scatter radiation and 2.75 in. |
Name the 3 Operator protective measures? | DistanceBarriersfocal spot |
What is the purpose of the lead foil on film? | To prevent scattered radiation and to make sure the film is exposed on the correct side. |
What is the minimum distance from the working area a safe light should be placed? | 4 feet |
What watts should the safe light bulb be? | 7.5 - 15 watts |
For patient protection, what is required? | 1.Small focal spot2.Proper film processing & handling3.Proper technique4.lead protection5.film speed6.Correct kvp7.Correct timer8.Correct MAs9.filtration10. collimator11.if xray won't change diagnosis,dont take it.12.no routine xrays13. examine to determi |
What are KVPs for? (3 things) | Contrast, sharpness, quality (high voltage tr) |
What are MAs for? (3 things) | Density, darkness, quantity (low voltage tr) |
What are components of the developer? | Hydroquinone (Black)Elon (gray) |
What is the main component of the fixer? | Ammonium thiosulfate or Sodium thiosulfate |
What is the MPD for healthworkers and the public? | Health Workers, 50 mSvPublic 5 mSv |