MDS PREP
Dead bone appears on a radiograph as
1. Radiolucent
2. Radiopaque
3. Cotton wool appearance
4. Salt and pepper appearance
Radiology
Answer: 2
Dead bone appears on a radiograph as radiopaque.
"Step ladders" effect in PA views of skull is found in
1. Sickle cell anaemia
2. Ameloblastoma
3. Osteogenic sarcoma
4. Ewing"s sarcoma
Radiology
Answer: 1
The "step ladders" effect in PA views of the skull is found in sickle cell anaemia.
Which of the following imaging techniques cannot differentiate benign and malignant tumours of salivary gland
1. Scintigraphy
2. CT scan
3. MRI
4. Sialography
Radiology
Answer: 1
Scintigraphy cannot differentiate benign and malignant tumours of the salivary gland.
The following produces highest radiation exposure
1. CT scan
2. MRI
3. Pantamograph
4. Arthrograms
Radiology
Answer: 4
The following produces the highest radiation exposure: arthrograms.
Which of the following is a possible cause for a low density radiograph
(light film?)
1. Cold developer
2. over exposure
3. Improper safety light
4. Excessive developing time
Radiology Answer: 1
Overexposure typically results in a darker film, not a lighter one. An improper safety light or excessive developing time would not directly cause a low density radiograph. It is essential to maintain the correct temperature and time in the developing process to achieve a diagnostic image quality. A cold developer will not fully develop the film, leading to a lighter, less detailed image.
Film exposed to light during development will appear
1. Dark
2. Light
3. Clear
4. Blurred
Radiology
Answer: 1
When film is exposed to light during the development process, it results in overexposure, leading to a dark appearance on the developed film. This is due to the silver halide crystals being activated by light, which causes them to darken when developed.
The view in which patient"s chin placed touching radiographic cassette
1. PA view of skull
2. Towne"s view
3. Submentovertex
4. Waters view
Radiology
Answer: 4
The view in which the patient's chin is placed touching the radiographic cassette is Waters view.
Quality of x-ray beam is dependent on which component of dental unit
1. Autotransformer
2. Ammeter
3. Temperature of cathode filament
4. Step-down transformer
Radiology
Answer: 1
Quality of the x-ray beam is dependent on the temperature of the cathode filament.