ABGD Radiology and Infection Control Question and answers correctly solved 2024/2025
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ABGD Radiology and Infection Control Question and answers correctly solved 2024/2025 ABGD Radiology and Infection Control, OMFS
What is the difference between Waters and Reverse Towne view? - correct answer - Reverse Towne view: forehead against sensor;
- Waters: chin against sensor;
What ...
ABGD Radiology and Infection Control,
OMFS
What is the difference between Waters and Reverse Towne view? - correct
answer ✔- Reverse Towne view: forehead against sensor;
- Waters: chin against sensor;
What radiograph should be used to detect submandibular sialolith? - correct
answer ✔- Mandibular occlusal film should be used with the exposure time
cut in half as sialoliths are less dense in this area;
What is CBCT houndsfield unit? - correct answer ✔- Houndsfield unit (HU)
measure the relative density of tissues as seen on CBCT;
- Denser the tissue, greater the H.U.;
What is beam hardening in CBCT? - correct answer ✔- Beam hardening
refers to distortions the metallic structures create as dark streaks and bands
between two metal objects;
Differentiate between critical, semi-critical and non-critical instruments. -
correct answer ✔- Critical instruments: penetrate soft tissue or bone; need to
be sterilized after each use;
- Semi-critical: contacts mucuous membranes; should be sterilized or get
high-level disinfection;
- Non-critical: contact with intact skin; use intermediate or low level
disinfection;
How do low/intermediate/high level disinfectants differ per EPA standards? -
correct answer ✔- High level: labeled as sterilizer/disinfectant; inactivates
, bacteria, fungi and viruses but not spores (glutaraldehyde, hydrogen
peroxide);
- Intermediate level: need to be labeled as tuberculocidal (iodophor, phenolic,
chlorine);
- Low level: labeled as hospital disinfectant (ethyl/isopropyl alcohol, bleach);
Identify three ways to inspect the sterilizer. - correct answer ✔- Mechanical:
checking cycle time, temperature, pressure needs to done for every load;
- Chemical: use of chemical indicators for every load internally and externally;
- Biologic: spore testing should be weekly/monthly; considered to be most
effective means;
What is the maximum acceptable colony forming units for tap water and
treatment water lines? - correct answer ✔- Tap water should have less than
or equal to 500 CFU/ml;
- Water for patient care should have less than 200 CFU/ml;
How does CBCT compare with CT? - correct answer ✔- CBCT uses
radiation more efficiently with more resolution;
- CBCT is less expensive, smaller and causes less motion artifacts;
What is short gray scale on contrast? - correct answer ✔- An image that has
both light and dark areas with multiple shades of gray of in between;
- If only light gray and dark gray zones exist with low contrast, this is long gray
scale of contrast;
What can be done to increase radio-density of an image? - correct answer
✔- Increase kVp, mA, exposure time;
- Decrease focal distance;
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