Quantity of current can be increased by 1) Increased milliamperage 2) Increased time 3) Increased tube current 4) All of the above
RadiologyAnswer: 4
When a shielded open cone is used the gonadal dose to a patient is mainly from 1) Leakage from tube 2) Primary X-ray tube 3) Scatters from patient"s face 4) All of the above
RadiologyAnswer: 3
The following is at more risk from exposure of a dental X-ray 1. Bone marrow 2. Breast 3. Brain 4. Thyroid
RadiologyAnswer: 1
The minimum equivalent of aluminium thickness necessary for proper filtration is 1. 1.5 mm for 70 kVp and 2.5 mm above 70 kVp 2. 2.5 mm for 70 kVp and 1.5 mm above 70 kVp 3. 2.5 mm for 70 kVp and above 70 kVp 4. None of the above
RadiologyAnswer: 1
Radiation dose to patient can be reduced by all of the following except 1) Speed films 2) Filters 3) By increasing target-object distance 4) Decreasing kilovoltage potential
RadiologyAnswer: 4
The skin of a patient undergoing radiotherapy will show after 2 weeks 1) Erythema 2) Depigmentation 3) Radiation-induced carcinomas 4) No change
RadiologyAnswer: 1
Screen films differ form non-screen films in that 1) They are more sensitive to light than X-rays 2) They are more sensitive to X-rays than light 3) They are usually used in intraoral radiography 4) They do not need intensifying screens
RadiologyAnswer: 2
Half value layer refers to 1) The rate at which an X-ray photon transfer"s the energy to irradiated matter 2) The thickness of a substance required to reduce the number of X-ray photons by half 3) Both the above 4) None of the above
