Medical Physics & Electrotherapy IB Quiz
Are you ready to test your understanding of how physics is applied in medical treatments? Our Medical Physics & Electrotherapy IB Quiz is designed to challenge your knowledge of this important interdisciplinary field. This quiz will cover essential concepts and practical applications of physics principles in the diagnosis and treatment of various health conditions.
You’ll encounter questions ranging from the basics of biomechanics to the detailed mechanisms of electrotherapy devices. This quiz provides a clear opportunity to assess your skills and deepen your understanding of medical physics and electrotherapy. Get ready to explore the integration of physics in modern Read moremedicine and see how much you really know about this fascinating subject.
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Medical Physics & Electrotherapy IB Questions and Answers
- 1.
What measures tissue resistance in electrotherapy?
- A.
Voltmeter
- B.
Ammeter
- C.
Impedance meter
- D.
Oscilloscope
Correct Answer
C. Impedance meterExplanation
An impedance meter measures the resistance of tissues to the flow of electrical current in electrotherapy. It is crucial because different tissues and conditions exhibit specific impedance characteristics, which affect how the treatment should be applied. Accurate impedance measurements help in customizing electrotherapy settings to optimize therapeutic outcomes, ensuring that the right amount of energy is delivered to the targeted area without causing discomfort or harm to the patient.Rate this question:
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- 2.
Which modality uses ultrasound for diagnostic imaging?
- A.
MRI
- B.
CT
- C.
Sonography
- D.
X-ray
Correct Answer
C. SonograpHyExplanation
Sonography, or ultrasound imaging, uses high-frequency sound waves to create images of the inside of the body. It is particularly useful for examining soft tissues, which do not show up well on X-rays. Ultrasound is non-invasive and does not use ionizing radiation, making it safe for a variety of applications, including fetal imaging during pregnancy, and assessing organ structure and function. The ability to see live images helps in real-time diagnosis and treatments.Rate this question:
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- 3.
What unit measures radiation exposure?
- A.
Gray
- B.
Sievert
- C.
Becquerel
- D.
Curie
Correct Answer
A. GrayExplanation
The Gray (Gy) is a unit of ionizing radiation dose in the International System of Units, used to measure the absorbed dose of radiation energy per unit mass of tissue. It is crucial in various applications, including radiotherapy, where it helps ensure that precise doses are administered to cancer patients. By measuring the energy absorbed, healthcare providers can better protect healthy tissue while maximizing the treatment impact on diseased tissues.Rate this question:
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- 4.
Which principle does MRI technology rely on?
- A.
X-ray
- B.
Sound waves
- C.
Nuclear magnetic resonance
- D.
Radio waves
Correct Answer
C. Nuclear magnetic resonanceExplanation
MRI, or Magnetic Resonance Imaging, utilizes the principles of nuclear magnetic resonance. In an MRI, the nuclei of hydrogen atoms in water molecules within the body are excited using a strong magnetic field and radio waves. When the nuclei return to their original state, they emit signals that are used to create detailed images of the body's internal structures. This technology is particularly adept at visualizing soft tissues and is invaluable in diagnosing a wide range of conditions.Rate this question:
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- 5.
What describes the effect of ionizing radiation on air molecules?
- A.
Photoelectric effect
- B.
Compton scattering
- C.
Ionization
- D.
Diffraction
Correct Answer
C. IonizationExplanation
Ionization in the context of medical physics refers to the process where ionizing radiation passes through air, causing the air molecules to lose electrons and form ions. This process is fundamental to the operation of various types of radiation detectors, which measure the concentration of ions to evaluate the presence and intensity of radiation. Understanding ionization is essential for ensuring radiation safety and effective application in medical imaging and treatments.Rate this question:
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- 6.
Which device is used for external beam radiotherapy?
- A.
LINAC
- B.
Cyclotron
- C.
Synchrotron
- D.
Magnetron
Correct Answer
A. LINACExplanation
A Linear Accelerator (LINAC) is used in external beam radiotherapy to treat cancer. It generates high-energy electrons that are targeted to conform to the shape of a patient's tumor. The accuracy and intensity of the beam can be controlled so that it destroys cancer cells while sparing surrounding healthy tissue. LINACs are pivotal in modern oncology because they offer precise treatment options with fewer side effects compared to traditional radiation therapy methods.Rate this question:
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- 7.
What is the primary use of a defibrillator?
- A.
Monitoring
- B.
Imaging
- C.
Shock delivery
- D.
Pacing
Correct Answer
C. Shock deliveryExplanation
A defibrillator is primarily used to deliver a therapeutic dose of electric current to the heart when a patient is experiencing life-threatening arrhythmias, such as ventricular fibrillation or pulseless ventricular tachycardia. The electric shock delivered by the defibrillator depolarizes a large amount of the heart muscle, ending the arrhythmia. This allows the body's natural pacemaker to regain control and re-establish a normal heart rhythm.Rate this question:
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- 8.
Which imaging technique involves a contrast agent?
- A.
Ultrasound
- B.
MRI
- C.
X-ray
- D.
CT scan
Correct Answer
D. CT scanExplanation
CT scans often require the use of a contrast agent, which is swallowed or injected into the patient’s bloodstream. The contrast agent helps to clearly define the organs and tissues being examined by making them appear different on the scan because it absorbs X-rays at a different rate than the surrounding tissues. This distinction helps in providing more detailed and accurate images, which are essential for diagnosis and treatment planning.Rate this question:
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- 9.
What does PET stand for in medical imaging?
- A.
Personal Electronic Transmitter
- B.
Positron Emission Tomography
- C.
Pulsed Energy Trial
- D.
Photon Emission Tracker
Correct Answer
B. Positron Emission TomograpHyExplanation
PET stands for Positron Emission Tomography, a type of imaging test that allows physicians to check for diseases in the body. The scanner detects the radiation emitted by a positron-emitting radionuclide in the organ or tissue being examined. The images produced show where the radioactive substances are distributed in the body, helping doctors to see how well organs and tissues are functioning. PET scans are particularly useful for detecting cancer and examining effects of cancer treatment.Rate this question:
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- 10.
What is the main purpose of a pacemaker?
- A.
Record ECG
- B.
Stabilize heartbeat
- C.
Measure pulse
- D.
Display data
Correct Answer
B. Stabilize heartbeatExplanation
A pacemaker is an electronic device implanted in the chest or abdomen to help control abnormal heart rhythms. This device uses electrical pulses to prompt the heart to beat at a normal rate, maintaining an adequate heart rhythm to meet the body’s needs. It is essential for patients with arrhythmias, such as bradycardia or heart block, where the heart beats too slowly.Rate this question:
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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
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Current Version
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Aug 22, 2024Quiz Edited by
ProProfs Editorial Team -
Apr 11, 2020Quiz Created by
Ajay Kumar
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