This set of Clinical Science Multiple Choice Questions & Answers (MCQs) focuses on “X-Ray”.
1. In a normal X-Ray machine, X – Rays are produced by ________
a) bombardment of cathode rays on a radioactive material
b) nuclear fission
c) nuclear fusion
d) super heating of an element
View Answer
Explanation: Cathode Rays are high speed electron beams that when fall on the radioactive materials causes the emission of electrons and energy. This energy is X-Ray. The X – Rays are emitted due to various types of collisions happening in the radioactive element with the emitted electron beams.
2. How much of the generated energy actually utilized for taking an X-Ray?
a) 0.1%
b) 1%
c) 10%
d) 100%
View Answer
Explanation: The X -Rays that are generated have a tendency to scatter. Thus, they are collimated. Also, the emitted X – Rays also strike against the metallic plate/radioactive material to produce more X – Rays. Also, energy is lost in the form of heat and light. Thus, effectively only 1% of the energy is used to produce X-Ray images.
3. Dental X-Ray is also known as __________
a) Orthopedics
b) Orthopentology
c) Orthology
d) Orthopantomography
View Answer
Explanation: Orthopantomography is the panoramic radiograph of the teeth. The teeth also need X-Ray to look into deformity, disease, in growths or outgrowths. It shows the tooth structure and ensures that the teeth are fine without any problems or deformities.
4. Which of the following machines is often placed together with an X-Ray machine?
a) Endoscopy
b) Ultrasound
c) Fluoroscopy
d) C – Arm
View Answer
Explanation: Fluoroscopy is a process in which a radioactive dye is injected or ingested by the patient. The dye moves along the path in the body and emits radiation. Sometimes, X – Rays may have to fall on the dye to make it emit radiations. These radiations are collected to form images thus a fluoroscopic setup is often found together with an X-Ray setup.
5. Up to what intensity of radiation is used for mammography?
a) < 10keV
b) < 20keV
c) < 30keV
d) < 40keV
View Answer
Explanation: Mammography is the X-Ray done for the breasts to detect breast stones or early stages of cancer. It is also called as mammography. Since the breast consists of soft tissue, the exposed radiation is of a lesser intensity and should not exceed 30keV.
6. What should be the minimum distance maintained when an X-Ray is being taken?
a) 10 m
b) 15 m
c) 35 m
d) 2 m
View Answer
Explanation: Normally when an X-Ray is being taken, the people who are not supposed to be exposed to the radiations will be in a safe room where the radiation does not reach due to protective glass and other precautions. However, in case a portable X-Ray is being used and the X-Ray is being performed on the bedside, then the one who performs the X-Ray must wear a protective lead jacket and the other people must maintain a distance of minimum 2m (6 feet).
7. Which of the following needs the longest exposure for an X-Ray image?
a) Thoracic
b) Abdomen
c) Spine
d) Pelvis
View Answer
Explanation: Spine needs around 0.20 seconds of exposure for the image to form properly. This can be because the spine faces a lot of obstruction when exposed to the X-Ray so needs almost twice the exposure time of thoracic and abdominal regions. They require only around 0.10 seconds of exposure.
8. The X-Ray is recorded on a plate coated with _____________
a) Gold Halide
b) Silver Halide
c) Copper Halide
d) Iron Halide
View Answer
Explanation: The plate coated with Silver Halide, mostly silver bromide is used to image the X – Rays. Silver halides when exposed to X – Rays end up becoming black and so the images of the X – Rays are formed.
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