Digital vs Film Imaging Practice Questions
20 free Digital vs Film Imaging practice questions for the CDA. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.
Which of the following is a primary advantage of digital imaging compared with traditional film-based radiography?
- A Lower cost of initial equipment
- B Significantly reduced radiation exposure
- C Decreased ability to enhance image quality
- D Increased need for chemical processing
Correct answer: Significantly reduced radiation exposure
Digital imaging generally requires less radiation to produce a diagnostic-quality image. Film requires higher exposure and chemical processing, which digital systems eliminate.
In digital radiography, which component converts X-ray photons directly into electronic signals?
- A Scintillator layer
- B Photostimulable phosphor plate
- C Direct digital sensor
- D Developer solution
Correct answer: Direct digital sensor
Direct digital sensors convert X-ray photons directly into electrical signals without the intermediate light conversion step. This allows faster image acquisition and better spatial resolution.
Which statement best describes the dynamic range of digital imaging compared with film?
- A Digital imaging has a narrower dynamic range than film
- B Digital has a wider dynamic range, cutting retakes
- C Film has an essentially unlimited dynamic range
- D Dynamic range is identical for both systems
Correct answer: Digital has a wider dynamic range, cutting retakes
Digital systems have a wider dynamic range, meaning they can capture both very light and very dark areas more effectively. This reduces the need for retakes due to exposure errors.
Which of the following is a disadvantage of digital sensors compared with film?
- A Higher radiation dose to the patient
- B Additional hazardous chemical waste
- C Bulkier sensors reduce patient comfort
- D Slower acquisition of the image
Correct answer: Bulkier sensors reduce patient comfort
Digital sensors are often bulkier than film packets, which can decrease patient comfort. However, they do not require chemical processing and provide rapid image acquisition.
What is the primary purpose of using a photostimulable phosphor (PSP) plate in digital radiography?
- A To develop film using processing chemicals
- B To store a latent image from X-ray energy
- C To reduce scatter radiation exposure
- D To automatically correct exposure errors
Correct answer: To store a latent image from X-ray energy
PSP plates store the latent image after exposure to X-rays. The image is later scanned and digitized by a laser reader.
Which imaging system generally offers the highest spatial resolution?
- A Traditional film
- B Direct digital sensors
- C PSP plate systems
- D Panoramic digital imaging
Correct answer: Traditional film
Traditional film still provides the highest spatial resolution, resolving finer detail than most digital sensors. Digital systems trade some resolution for lower patient dose and easier image processing.
Which of the following is eliminated when switching from film imaging to digital imaging?
- A The need for proper exposure settings
- B The need for infection control barriers
- C The need for chemical processing solutions
- D The need for calibration of equipment
Correct answer: The need for chemical processing solutions
Digital imaging eliminates chemical processing, reducing time and environmental waste. Other requirements such as exposure settings and infection control remain necessary.
Which factor allows digital images to be manipulated for clearer diagnosis?
- A Automatic retakes after errors
- B Adjustable contrast and brightness
- C Use of intensifying screens
- D Chemical solution replenishment
Correct answer: Adjustable contrast and brightness
Digital imaging software allows adjustments like brightness, contrast, and magnification. These enhancements support improved diagnostic interpretation.
Compared with film, digital radiography typically results in:
- A Longer time for image acquisition
- B Higher radiation exposure to the patient
- C Instant or near-instant image viewing
- D More frequent retakes
Correct answer: Instant or near-instant image viewing
Digital systems provide rapid viewing of images, often instantly. This speeds up workflow and reduces the need for retakes.
Which of the following is TRUE regarding storage of digital radiographs?
- A They require dedicated physical storage rooms
- B They gradually degrade over time like film
- C They can be electronically backed up long-term
- D They cannot be shared electronically at all
Correct answer: They can be electronically backed up long-term
Digital images can be stored and backed up electronically, ensuring long-term retention. They also avoid physical deterioration seen in film.
Which digital sensor technology uses fiber-optic plates to protect sensor components from radiation damage?
- A CCD sensors
- B CMOS sensors
- C PSP plates
- D Screen-film cassettes
Correct answer: CCD sensors
CCD sensors often use fiber-optic plates to guide light and protect sensitive components. This design helps maintain sensor longevity.
Film radiography requires which environmental condition for processing?
- A Bright ambient lighting
- B Total darkness during processing
- C No temperature control at all
- D Very dry air conditions
Correct answer: Total darkness during processing
Film must be processed in a darkroom to prevent premature exposure. Temperature and humidity also need careful control.
Which of the following best describes retake frequency in digital imaging compared with film?
- A Higher due to poor resolution
- B Higher due to limited dynamic range
- C Lower due to exposure tolerance
- D Same for both systems
Correct answer: Lower due to exposure tolerance
Digital imaging’s wider exposure latitude reduces errors, leading to fewer retakes. Film is more sensitive to incorrect exposure.
Which system typically requires the most maintenance for producing diagnostic images?
- A Direct digital sensors
- B PSP plate systems
- C Film processing with chemicals
- D None require maintenance
Correct answer: Film processing with chemicals
Film processing requires ongoing chemical replenishment, temperature monitoring, and upkeep. Digital systems reduce this workload significantly.
A major environmental benefit of digital radiography is:
- A Reduced need for duplicate images
- B Elimination of chemical processing waste
- C Elimination of digital storage needs
- D Reduced overall equipment costs
Correct answer: Elimination of chemical processing waste
Digital radiography eliminates chemical processing, reducing environmental waste. Film systems create hazardous chemical byproducts.
Which of the following factors is most important when positioning a digital sensor inside the patient's mouth?
- A Avoiding digital sensor calibration
- B Maintaining chemical cleanliness
- C Firm placement due to sensor rigidity
- D Ensuring the film bends properly
Correct answer: Firm placement due to sensor rigidity
Digital sensors are more rigid and require careful placement for patient comfort and accurate imaging. Unlike film, digital sensors do not bend.
Which characteristic is typically better with PSP plate systems compared to direct digital sensors?
- A Instant image availability after exposure
- B Greater flexibility and patient comfort
- C Higher spatial image resolution
- D Lower risk of losing the image
Correct answer: Greater flexibility and patient comfort
PSP plates are thinner and more flexible, making them more comfortable for patients. However, they require scanning and are not instant.
Digital radiography reduces patient radiation dose primarily because:
- A It uses faster exposure times
- B It requires heavier shielding
- C It uses high-speed film
- D It reduces scatter radiation
Correct answer: It uses faster exposure times
Digital systems require less exposure to produce diagnostic-quality images. This reduction in exposure time lowers patient dose.
Film radiography requires quality control of chemical solutions to avoid:
- A Overexposure of the digital sensors
- B Artifacts and inconsistent density
- C Excessive digital image sharpening
- D Automatic contrast enhancement
Correct answer: Artifacts and inconsistent density
Improper chemical concentration or temperature can cause film artifacts and density inconsistencies. Digital imaging eliminates these chemical variables.
Which statement best describes sensor durability in digital radiography?
- A Sensors are fragile, needing careful handling
- B Sensors are essentially indestructible
- C Sensors cannot be damaged by bending
- D Sensors require chemical hardening treatment
Correct answer: Sensors are fragile, needing careful handling
Digital sensors contain delicate electronic components and must be handled with care. Excess force, drops, or bending can cause damage.