Radiology Flashcards
What has the shortest wavelenth and the highest energy?
X-Ray
What happens when the milliamperage is doubled?
The intensity of an X-ray beam is doubled
Kilovoltage (kVP) primarily controls what?
Contrast and is the penetrating characteristic of an Xray
What is X-ray penetration determined by?
kVP
What primarily influences the resolution?
Focal spot size
What is the most radio-resistant and sensitive tissue?
Resistant - nerve & muscle cells
Sensitive - hematopoetic
What are intensifying screens used for?
To decrease the exposure time, reduce radiation exposure
What does complication of radiation treatment in children include?
- Stunted roots
- Micrognathia
- Condylar hyperplasia
- Malocclusion
What is a coin test used for?
To detect light leakage
Doubling the distance from the radiation source does what to the radiation?
Diminishes by a factor of 4 (inverse square law)
Why is radiograph rinsed with water?
To accomplish getting rid of chemicals
What is the filter in a dental xray machine made of?
Aluminum
What is the effective dose?
Comparison of the radiation risk in humans from different radiograph exams and doses/sources
What is the greatest source of background radiation on earth?
Radon
What is the major biologic damage from ionizing radiation primarily due to?
Radiolysis of the water molecules
How do electrons flow?
From cathode to anode with the energy converted to heat
What is the term for the geometric unsharpness with a fuzzy area surrounding the contours of the teeth and osseous tissues?
Penumbra
Why is an intensifying screen used with external radiographs?
To decrease the radiation exposure
