RADIOLOGY LECTURE 3 ~~~
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Questions and Answers

What type of effect occurs when an X-ray photon interacts with an inner shell electron and becomes absorbed?

  • Photoelectric effect (correct)
  • Photoionization
  • Compton scatter
  • Bremsstrahlung effect

Which macromolecule is least likely to be directly ionized by X-ray photons?

  • Lipids (correct)
  • Proteins
  • DNA
  • RNA

What effect does higher atomic number have on the likelihood of the photoelectric effect occurring?

  • It decreases the likelihood of absorption.
  • It causes total reflection of X-rays.
  • It has no effect on absorption.
  • It increases the likelihood of absorption. (correct)

In the process of indirect ionization from X-rays, which component is primarily responsible for causing damage to DNA?

<p>Free radicals generated from water decomposition (A)</p> Signup and view all the answers

Which outcome of an X-ray indicates that no absorption took place?

<p>Pure scatter (C)</p> Signup and view all the answers

What is the primary reason the photoelectric effect is preferred during X-ray imaging?

<p>It produces a whiter/more opaque image. (C)</p> Signup and view all the answers

What type of damage can occur in DNA due to direct ionization from X-rays?

<p>Point mutations (A)</p> Signup and view all the answers

What occurs during the Compton effect when an X-ray interacts with matter?

<p>The X-ray is deflected and part of its energy is lost. (D)</p> Signup and view all the answers

What happens to the photon during the Compton effect?

<p>It can undergo further collisions or be deflected. (D)</p> Signup and view all the answers

In the Compton effect, what happens to the energy of the photon after the collision?

<p>Some energy is lost, but it remains active. (B)</p> Signup and view all the answers

What type of atom is created in the Compton effect after the photon interacts?

<p>An unstable atom with a vacancy in the outer orbit. (D)</p> Signup and view all the answers

Which effect is preferred in X-ray imaging and why?

<p>The photoelectric effect; it results in fewer X-rays reaching the detector. (A)</p> Signup and view all the answers

What are the consequences of deterministic effects from radiation exposure?

<p>They lead to observable effects that are dose-dependent. (C)</p> Signup and view all the answers

What is the risk of stochastic effects in dental diagnostics?

<p>It is low due to the very low doses used. (D)</p> Signup and view all the answers

What might occur as a result of a point mutation at the chromosomal level?

<p>Potential for cell death or abnormal replication. (D)</p> Signup and view all the answers

What differentiates the ejected electron in the Compton effect from that in the photoelectric effect?

<p>It has higher energy in the Compton effect. (A)</p> Signup and view all the answers

Flashcards

Deterministic effects in Dentistry

Effects that occur in dentistry, where the dosage of X-rays is extremely low and below the threshold, making deterministic effects highly improbable.

Photoelectric effect

An X-ray interaction where an electron is ejected from an inner shell, absorbing the entire X-ray energy.

Compton scatter

An interaction where an X-ray photon collides with an electron, scattering it.

Ionizing radiation

Atom that becomes a positive ion after an electron is ejected, a consequence of the photoelectric effect.

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Direct ionization effect

X-rays directly ionize DNA, RNA, proteins, and enzymes causing damage.

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Indirect ionization effect

X-rays cause water to break down creating free radicals that damage DNA (more common damage mechanism).

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Preferred X-ray interaction

The preference is given to the photoelectric effect in X-rays due to its ability to produce whiter, more opaque images when fewer X-rays reach the detector.

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Possible X-ray outcomes

X-rays can be absorbed, transmitted, scattered, absorbed and scattered, or purely scattered without absorption.

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Compton effect

X-ray photon interacts with outer shell electron, losing some energy and scattering.

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Photoelectric effect

X-ray photon ejects inner shell electron; photon's energy used fully.

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Deterministic effect

Cell death guaranteed above a specific radiation dose.

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Stochastic effect

Cell mutations possible at any radiation dose; no safe dose.

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Somatic cell

Body cells—radiation damage leads to radiation-induced malignancy.

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Genetic cell

Reproductive cells—radiation damage may cause congenital abnormalities.

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Point mutation

A change in a single DNA base.

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X-ray preference

Photoelectric effect preferred for image quality; less radiation reaches detector, making it whiter.

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