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LDS |ALL CHAPTERS | QUESTIONS & 100% VERIFIED
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ANSWERS AND RATIONALES | GRADED A+
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,CHAPTER 1: INTRODUCTION TO RADIOLOGIC SCIENCE 9 % 9% 9 % 9% 9 %




1. Which of the following best describes the primary purpose of diagnosti
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c radiography?
9%




A. To treat diseases using ionizing radiation
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B. To produce images of internal structures for diagnosis
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C. To monitor patient vital signs
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D. To sterilize medical equipment
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Answer: B 9%




Rationale: Diagnostic radiography’s main purpose is to produce images of internal
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body structures, allowing physicians to detect and diagnose abnormalities. Option
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s A, C, and D are unrelated to diagnostic imaging.
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2. What is the primary source of ionizing radiation in medical imaging?
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A. MRI scanner 9%




B. X-ray tube 9%




C. Ultrasound transducer 9%




D. PET scanner 9%




Answer: B 9%




Rationale: The X- 9% 9%




ray tube generates ionizing radiation used in diagnostic radiography. MRI and
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ultrasound use non- 9% 9%




ionizing energy, while PET uses radioactive tracers rather than producing radiat
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ion in a tube.
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3. How does the ALARA principle guide radiologic practice?
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A. Maximizing image quality regardless of dose 9% 9% 9% 9% 9%




B. Minimizing radiation exposure while achieving diagnostic quality 9% 9% 9% 9% 9% 9%




C. Limiting patient interaction to reduce infection 9% 9% 9% 9% 9%




D. Increasing exposure time for better penetration 9% 9% 9% 9% 9%




Answer: B 9%




Rationale: ALARA (“As Low As Reasonably Achievable”) ensures patient and
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staff receive the minimum radiation dose necessary for diagnostic-
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quality images. 9%

,4. A radiologic technologist is preparing to image a patient with a suspecte
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d fracture. Which safety measure is most important?
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A. Using the fastest imaging speed
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B. Ensuring proper patient shielding and positioning
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C. Increasing exposure to reduce repeat images 9% 9% 9% 9% 9%




D. Allowing the patient to move during imaging 9% 9% 9% 9% 9% 9%




Answer: B 9%




Rationale: Proper shielding and positioning minimize unnecessary exposure and p
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rotect radiosensitive tissues. Options A, C, and D can increase radiation risk or de
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grade image quality.
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5. Scenario: A 45-year- 9% 9%




old patient expresses concern about radiation exposure. How should the techn
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ologist respond? 9%




A. Ignore their concerns; radiation is safe
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B. Explain that dose is minimized and benefits outweigh risks
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C. Refuse to perform the exam 9% 9% 9% 9%




D. Increase exposure to ensure better images9% 9% 9% 9% 9%




Answer: B 9%




Rationale: Patients should be informed about the low dose and the diagnostic be
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nefits, reducing anxiety and promoting informed consent.
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6. Which professional organization establishes standards for radiologi
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c technologists?
9%




A. WHO
B. ASRT
C. FDA
D. CDC
Answer: B 9%




Rationale: The American Society of Radiologic Technologists (ASRT) sets educa
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tional and professional standards. FDA regulates equipment, CDC focuses on infectio
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n control, WHO on global health.
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, 7. Which imaging modality does not use ionizing radiation?
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A. CT scan 9%




B. MRI
C. X-ray
D. Fluoroscopy
Answer: B 9%




Rationale: MRI uses magnetic fields and radio waves, which are non-
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ionizing. CT, X-ray, and fluoroscopy all use ionizing radiation.
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8. What is the most radiosensitive tissue in the human body?
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A. Muscle
B. Skin
C. Bone marrow 9%




D. Cartilage
Answer: C 9%




Rationale: Bone marrow contains rapidly dividing cells, making it highly sensitive
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to ionizing radiation. Muscle, skin, and cartilage are less sensitive.
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9. Which factor primarily affects the quality of an X-ray image?
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A. Patient diet 9%




B. Tube voltage and current
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C. Room temperature 9%




D. Technologist height 9%




Answer: B 9%




Rationale: Tube voltage (kVp) and current (mA) control X-
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ray energy and photon quantity, directly affecting image quality.
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10. How often should radiologic equipment be tested for quality assurance?
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A. Daily
B. Monthly
C. Annually
D. Only when malfunction occurs
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