MDS PREP
Light radiographic film is due to
1. Overdeveloping
2. Overfixing
3. Directly putting in fixer
4. Exposure to sunlight
Radiology Answer: 2
Overfixing occurs when the radiographic film remains in the fixing solution for an extended period, leading to excessive clearing of the image. Fixing agents, such as sodium thiosulfate, dissolve unexposed silver halide crystals. Prolonged exposure results in a lighter image as even some of the developed silver may be affected. Other options, such as overdeveloping, directly putting in fixer, or sunlight exposure, typically lead to other issues like dark films or fogging.
Density of film is inversly proportional to all of the following except
1. Collimation
2. Filteration
3. Target-film distance
4. Kilo volt
Radiology
Answer: 4
The density of a radiographic film is inversely proportional to factors like collimation, filtration, and target-film distance, but not to kilovoltage (kV), which affects the quality of the image.
The best radiographic view for TMJ is
1. Lateral oblique
2. PA view
3. Waters view
4. OPG
Radiology
Answer: 4
The best radiographic view for TMJ is OPG.
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.
Interproximal caries is best detected by
1. Bitewing radiography
2. Periapical
3. Occlusal
4. None of the above
Interproximal caries is best detected by bitewing radiography.
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.
Intensifying screen is used in extraoral radiograph to
1. Decrease patient radiation
2. Increase contrast
3. Decrease contrast
4. Collimation
Radiology
Answer: 1
Intensifying screen is used in extraoral radiographs to decrease patient radiation.
The cathode in Coolidge tube is made of..............whereas anode is made of...............
1. Copper; copper
2. Molybdenum; copper
3. Iron; lead
4. Aluminium; iron
Radiology
Answer: 2
The cathode in a Coolidge tube is made of molybdenum, whereas the anode is made of copper.