ESTUDYR
MKA SAMENVATTING BEELDVORMING QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |
ASSURED SUCCESS
1. What is the first step in the diagnostic cycle?
A) Additional imaging
B) Clinical examination (history, intra/extra-oral exam)
C) Differential diagnosis
D) Treatment planning
Answer: B) Clinical examination (history, intra/extra-oral exam)
Rationale: The diagnostic cycle begins with gathering clinical data through patient history and physical
examination before proceeding to imaging or differential diagnosis.
2. Which imaging technique uses sound waves?
A) MRI
B) Ultrasound
C) OPT
D) CBCT
Answer: B) Ultrasound
Rationale: Ultrasound employs high-frequency sound waves to create images, unlike MRI (magnetism),
OPT/CBCT (X-rays).
3. In X-ray imaging, photons are produced when electrons collide with the:
A) Cathode
B) Anode
C) Filter
D) Detector
Answer: B) Anode
Rationale: X-ray photons are generated at the anode (positive electrode) when high-speed electrons
from the cathode strike it.
4. Which factor does NOT linearly increase X-ray photon quantity?
,ESTUDYR
A) Exposure time
B) Tube current (mA)
C) Voltage (kV)
D) All increase linearly
Answer: C) Voltage (kV)
Rationale: Higher kV increases photon energy (quality) but not quantity linearly like mA or time.
5. Compton scattering results in:
A) Complete photon absorption
B) Ionization without tissue damage
C) Scattered photons causing image noise
D) Enhanced image contrast
Answer: C) Scattered photons causing image noise
Rationale: Compton scattering deflects photons, reducing image clarity by adding non-diagnostic noise.
6. X-ray attenuation depends primarily on:
A) Patient age
B) Tissue atomic number and density
C) Room temperature
D) X-ray tube lifespan
Answer: B) Tissue atomic number and density
Rationale: Higher atomic number/density materials (e.g., bone) attenuate more X-rays due to greater
electron density.
7. In OPT imaging, the "focal trough" sharpness is determined by:
A) Patient height
B) Detector rotation speed
C) X-ray tube voltage
D) Exposure time
Answer: B) Detector rotation speed
Rationale: Slower detector movement creates a narrower, sharper focal trough.
, ESTUDYR
8. A "ghost image" in OPT appears due to structures located:
A) Between the X-ray source and rotation center
B) Within the focal trough
C) Behind the rotation center
D) At the detector surface
Answer: A) Between the X-ray source and rotation center
Rationale: Ghost images are blurred, magnified artifacts from objects anterior to the rotation axis.
9. The "waterskier position" in OPT avoids superimposition of:
A) Maxillary incisors
B) Cervical spine
C) Mandibular condyles
D) Soft palate
Answer: B) Cervical spine
Rationale: Head extension prevents spine overlap with dental structures.
10. Which is NOT a limitation of OPT?
A) Geometric distortion
B) Ghost/double images
C) Excellent 3D visualization
D) 2D representation
Answer: C) Excellent 3D visualization
Rationale: OPT provides 2D images with no depth information, unlike CBCT/CT.
11. Hounsfield units in CT are calibrated between:
A) -1000 (air) and 0 (water)
B) 0 (bone) and 1000 (metal)
C) -500 (fat) and 500 (muscle)
D) 100 (soft tissue) and 1000 (enamel)
Answer: A) -1000 (air) and 0 (water)
Rationale: This standardized scale allows tissue density comparisons.
MKA SAMENVATTING BEELDVORMING QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |
ASSURED SUCCESS
1. What is the first step in the diagnostic cycle?
A) Additional imaging
B) Clinical examination (history, intra/extra-oral exam)
C) Differential diagnosis
D) Treatment planning
Answer: B) Clinical examination (history, intra/extra-oral exam)
Rationale: The diagnostic cycle begins with gathering clinical data through patient history and physical
examination before proceeding to imaging or differential diagnosis.
2. Which imaging technique uses sound waves?
A) MRI
B) Ultrasound
C) OPT
D) CBCT
Answer: B) Ultrasound
Rationale: Ultrasound employs high-frequency sound waves to create images, unlike MRI (magnetism),
OPT/CBCT (X-rays).
3. In X-ray imaging, photons are produced when electrons collide with the:
A) Cathode
B) Anode
C) Filter
D) Detector
Answer: B) Anode
Rationale: X-ray photons are generated at the anode (positive electrode) when high-speed electrons
from the cathode strike it.
4. Which factor does NOT linearly increase X-ray photon quantity?
,ESTUDYR
A) Exposure time
B) Tube current (mA)
C) Voltage (kV)
D) All increase linearly
Answer: C) Voltage (kV)
Rationale: Higher kV increases photon energy (quality) but not quantity linearly like mA or time.
5. Compton scattering results in:
A) Complete photon absorption
B) Ionization without tissue damage
C) Scattered photons causing image noise
D) Enhanced image contrast
Answer: C) Scattered photons causing image noise
Rationale: Compton scattering deflects photons, reducing image clarity by adding non-diagnostic noise.
6. X-ray attenuation depends primarily on:
A) Patient age
B) Tissue atomic number and density
C) Room temperature
D) X-ray tube lifespan
Answer: B) Tissue atomic number and density
Rationale: Higher atomic number/density materials (e.g., bone) attenuate more X-rays due to greater
electron density.
7. In OPT imaging, the "focal trough" sharpness is determined by:
A) Patient height
B) Detector rotation speed
C) X-ray tube voltage
D) Exposure time
Answer: B) Detector rotation speed
Rationale: Slower detector movement creates a narrower, sharper focal trough.
, ESTUDYR
8. A "ghost image" in OPT appears due to structures located:
A) Between the X-ray source and rotation center
B) Within the focal trough
C) Behind the rotation center
D) At the detector surface
Answer: A) Between the X-ray source and rotation center
Rationale: Ghost images are blurred, magnified artifacts from objects anterior to the rotation axis.
9. The "waterskier position" in OPT avoids superimposition of:
A) Maxillary incisors
B) Cervical spine
C) Mandibular condyles
D) Soft palate
Answer: B) Cervical spine
Rationale: Head extension prevents spine overlap with dental structures.
10. Which is NOT a limitation of OPT?
A) Geometric distortion
B) Ghost/double images
C) Excellent 3D visualization
D) 2D representation
Answer: C) Excellent 3D visualization
Rationale: OPT provides 2D images with no depth information, unlike CBCT/CT.
11. Hounsfield units in CT are calibrated between:
A) -1000 (air) and 0 (water)
B) 0 (bone) and 1000 (metal)
C) -500 (fat) and 500 (muscle)
D) 100 (soft tissue) and 1000 (enamel)
Answer: A) -1000 (air) and 0 (water)
Rationale: This standardized scale allows tissue density comparisons.
