MDS PREP
Bilateral asymptomatic cyst like radiolucent lesion in a 7-year-old boy at the angle of mandible may be diagnosed as
1. Cherubism
2. Paget"s disease
3. Fibrous dysplasia
4. Static bone cyst
Radiology
Answer: 1
A bilateral asymptomatic cyst-like radiolucent lesion in a 7-year-old boy at the angle of the mandible may be diagnosed as cherubism.
In radionuclide imaging the most useful radiopharmaceutical for skeletal imaging is
1. Gallium 67
2. Technetium-sulphur-colloid
3. Technetium-99m
4. Technetium-99m linked to Methylene disphosphonate
In radionuclide imaging, the most useful radiopharmaceutical for skeletal imaging is Technetium-99m linked to Methylene diphosphonate.
Image of a hair appears on a radiograph which was exposed in a cassette. The hair would have been located in all of the following to produce this image except in
1. On the front of the cassette
2. Between film and front intensifying screen
3. Between film and back intensifying screen
4. On the film during development
Radiology
Answer: 4
Image of a hair appears on a radiograph which was exposed in a cassette. The hair would have been located in all of the following to produce this image except on the film during development.
"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.
Lamina dura is
1. Radiographic appearance of alveolar bone proper
2. Radiographic appearance of cortical bone
3. Radiographic appearance of cancellous bone
4. All of the above
Radiology
Answer: 1
Lamina dura is the radiographic appearance of alveolar bone proper.
Submentovertex is useful in viewing
1. Body of mandible
2. Fractures of zygomatic arch
3. Fractures of base of skull
4. All of the above
Radiology
Answer: 4
Submentovertex is useful in viewing all of the above: body of mandible, fractures of zygomatic arch, fractures of base of skull.
The wavelength of X-ray photon depends upon
1) Milli amperage
2) Kilo voltage
3) Distance between source and object
4) Quantity of electrons in the cathod stream
Radiology
Answer: 2
The wavelength of X-ray photon depends upon kilo voltage.
The wavelength of X-rays is inversely proportional to their energy, and the
energy of X-ray photons is determined by the kilo voltage (kV) used in the X-ray
tube. Higher kV results in higher energy and shorter wavelength photons, which
are more penetrating and are used for imaging denser tissues, while lower kV
results in lower energy and longer wavelength photons, which are less
penetrating and are used for imaging softer tissues. The other factors mentioned
(milli amperage, distance between source and object, and quantity of electrons
in the cathodic stream) affect the intensity of the X-ray beam but not the
wavelength of the photons.
Selection of kilovoltage for dental films depends on
1. Target-firm distance
2. Film-object distance
3. Density of tissues radiographed
4. All of the above
Radiology
Answer: 3
Selection of kilovoltage for dental films depends on the density of tissues radiographed.