Dental Radiology Practice Trivia

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Questions: 9 | Viewed: 66,634


The cathode and anode are parts of an X-ray tube. The anode is negatively charged. Which statement is correct?

Answer: The first statement is correct. The second statement is wrong
The cathode and anode are indeed parts of an x-ray tube, which makes the first statement correct. However, the anode is positively charged, not negatively charged, making the second statement incorrect.

One of the following types of radiation has high Linear Energy Transfer (LET) and hence the potential for more radiation-related tissue damage:

Answer: Alpha rays
Alpha rays have high Linear Energy Transfer (LET) and, therefore, have the potential for more radiation-related tissue damage. LET is a measure of the rate at which energy is deposited in tissue per unit length of the particle's track. Alpha particles are relatively large and heavy compared to gamma rays and X-rays, and they carry a positive charge. This characteristic makes alpha particles more effective in causing ionization and producing damage to biological tissues. Gamma rays, X-rays, microwaves, and ultraviolet (U-V) radiation generally have lower LET and are less damaging to biological tissues.

In the construction of an X-ray tube, the function of a step-down transformer is to

Answer: Convert the line current of 110 volts  (110 volts is power) to less than 10 million amperes.
The function of a step-down transformer in an X-ray tube is to reduce the line current of 110 volts to less than 10 million amperes. This transformation is crucial as handling such high currents directly would be impractical and hazardous. By decreasing the current while increasing the voltage, the transformer ensures the safe and efficient operation of the X-ray tube for medical imaging purposes.

In the radiographic principle, "SLOB rule, "the same side movement of the object is ______, and the opposite side movement of the object is ______. What are the missing words in the same sequence?

Answer: Lingual and buccal
The SLOB rule in radiographic principles states that when the object moves in the same direction as the x-ray tube, it appears to move in a lingual direction on the radiograph. Conversely, when the object moves in the opposite direction of the x-ray tube, it appears to move in a buccal direction on the radiograph. Therefore, the missing words in the same sequence are "lingual" and "buccal."

70 kilovolts equals

Answer: 70,000 volts
1 kV = 1000 volts, hence 70 kV equals 70,000 volts

The "rotating anode" design in an x-ray tube limits the amount of

Answer: Heat production at anode
The rotating anode design in an x-ray tube limits the amount of heat production at the anode. This design allows for the anode to rotate, distributing the heat generated during the x-ray production over a larger surface area. By doing so, it prevents the anode from overheating and potentially damaging the tube. This is important because excessive heat can degrade the performance of the x-ray tube and shorten its lifespan.

An example of an electromagnetic radiation is __________ rays.

Answer: Gamma rays
Gamma rays are an example of electromagnetic radiation because they are high-energy photons that are emitted during radioactive decay or nuclear reactions. Unlike alpha and beta rays, which consist of particles (alpha particles and beta particles) with mass and charge, gamma rays have no mass or charge. They have the highest frequency and shortest wavelength among the electromagnetic spectrum, making them highly penetrating and ionizing. Gamma rays are commonly used in medical imaging, cancer treatment, and sterilization processes due to their ability to pass through materials and interact with matter.

The sharpness of the image is determined to a large extent by the

Answer: The focal spot size
The focal spot size is a key factor in determining the sharpness of an image in X-ray imaging. The focal spot size refers to the size of the area on the anode from which X-rays are emitted. A smaller focal spot size produces a sharper image because it allows for better spatial resolution and finer detail to be captured. On the other hand, a larger focal spot size can result in a blurrier image with reduced clarity. Therefore, the focal spot size plays a crucial role in determining the sharpness of an X-ray image.

The "p" in kVp stands for

Answer: Peak
p is the peak of the kilovoltage as it represents the peak energy of the beam. In a 70kVp beam only some of the photons have the energy representative of 70 kV while the rest of the photons have a lower energy ranges. That is why the beam is called "polychromatic beam"
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