MDS PREP
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.
Filament in X-ray tube is heated by
1. Step-up high voltage transformer
2. Auto transformer
3. Step-down low voltage transformer
4. Ammeter
Radiology
Answer: 3
The filament in the X-ray tube is heated by the step-down low voltage transformer.
When evaluating intraoral periapical films which structures have improved sharpness
1. Lingual structures
2. Buccal structures
3. Interproximal structures
4. All of them equally
Radiology
Answer: 1
When evaluating intraoral periapical films, lingual structures have improved sharpness.
Multiple radiolucencies are common in all of the following except
1. Multiple myeloma
2. Hyperparathyroidism
3. Osteopetrosis
4. Metastatic tumours of bone
Radiology
Answer: 3
Multiple radiolucencies are common in all of the following except osteopetrosis.
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.
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.
Zonography is a type of
1. CT scan
2. Radionuclide imaging
3. Panoramography
4. MRT
Radiology
Answer: 3
Zonography is a type of panoramography.
The TMJ view that is used to view fractures of neck of condyle is
1. Trancranial
2. Infracranial
3. Both the above
4. None of the above
The TMJ view that is used to view fractures of the neck of the condyle is infracranial.