Master Your LRA 220 Final: Lower
Extremity & Pelvis Radiography Positioning
Guide (2026)
Description:
Struggling to prep for your LRA 220 final or radiographic positioning exam? This is the ultimate
2026 guide. We provide clear, direct answers with explanations to the most critical questions
on lower extremity and pelvis positioning. Master the central ray (CR) angles for toes, foot,
and calcaneus, understand when to use a grid, and learn the essential projections for the
ankle, knee, and femur. Our guide breaks down complex topics like the mortise view, Camp-
Coventry projection, and key pathologies like SCFE and Legg-Calvé-Perthes disease. Stop
stressing and start mastering the material that will be on your test.
Stop Guessing, Start excelling. Download Your Free Study Guide Now!
, Radiography Positioning Exam: Lower Extremity & Pelvis Q&A
(2026 Guide)
1. Which of the following projection sequences is standard for a radiographic examination of the
toes?
a) AP, Lateral, AP Oblique (Medial Rotation)
b) PA, Lateral, PA Oblique
c) AP and Lateral only
Answer: a) AP, Lateral, AP Oblique (Medial Rotation)
Explanation: This three-view series provides a comprehensive assessment of the phalanges and
interphalangeal joints from multiple perspectives, essential for visualizing fractures or
dislocations.
2. According to current guidelines, a grid is typically employed for radiographic procedures when
the body part thickness exceeds what measurement?
Answer: 10 cm
Explanation: Grids are used to absorb scatter radiation, which improves image contrast. Scatter
becomes a significant factor and degrades image quality when the body part being imaged is
greater than 10 cm in thickness.
3. What is the appropriate Image Receptor (IR) size and orientation for a toe series?
Answer: 8 x 10 inch IR, placed in landscape orientation.
Explanation: The landscape orientation efficiently accommodates the width of the forefoot and
the length of multiple toes, minimizing the need for repeat exposures.
4. For an AP axial projection of the foot, what is the recommended central ray angulation and
direction?
Answer: 10 degrees cephalad (toward the heel).
Explanation: This angulation helps to open up the intertarsal joints and reduces the
foreshortening of the metatarsals, providing a clearer view of the tarsal bones and their
articulations.
5. For standard AP and oblique projections of the toes, at which anatomical landmark is the central
ray directed?
Answer: The Metatarsophalangeal (MTP) joint of the toe of interest.
Extremity & Pelvis Radiography Positioning
Guide (2026)
Description:
Struggling to prep for your LRA 220 final or radiographic positioning exam? This is the ultimate
2026 guide. We provide clear, direct answers with explanations to the most critical questions
on lower extremity and pelvis positioning. Master the central ray (CR) angles for toes, foot,
and calcaneus, understand when to use a grid, and learn the essential projections for the
ankle, knee, and femur. Our guide breaks down complex topics like the mortise view, Camp-
Coventry projection, and key pathologies like SCFE and Legg-Calvé-Perthes disease. Stop
stressing and start mastering the material that will be on your test.
Stop Guessing, Start excelling. Download Your Free Study Guide Now!
, Radiography Positioning Exam: Lower Extremity & Pelvis Q&A
(2026 Guide)
1. Which of the following projection sequences is standard for a radiographic examination of the
toes?
a) AP, Lateral, AP Oblique (Medial Rotation)
b) PA, Lateral, PA Oblique
c) AP and Lateral only
Answer: a) AP, Lateral, AP Oblique (Medial Rotation)
Explanation: This three-view series provides a comprehensive assessment of the phalanges and
interphalangeal joints from multiple perspectives, essential for visualizing fractures or
dislocations.
2. According to current guidelines, a grid is typically employed for radiographic procedures when
the body part thickness exceeds what measurement?
Answer: 10 cm
Explanation: Grids are used to absorb scatter radiation, which improves image contrast. Scatter
becomes a significant factor and degrades image quality when the body part being imaged is
greater than 10 cm in thickness.
3. What is the appropriate Image Receptor (IR) size and orientation for a toe series?
Answer: 8 x 10 inch IR, placed in landscape orientation.
Explanation: The landscape orientation efficiently accommodates the width of the forefoot and
the length of multiple toes, minimizing the need for repeat exposures.
4. For an AP axial projection of the foot, what is the recommended central ray angulation and
direction?
Answer: 10 degrees cephalad (toward the heel).
Explanation: This angulation helps to open up the intertarsal joints and reduces the
foreshortening of the metatarsals, providing a clearer view of the tarsal bones and their
articulations.
5. For standard AP and oblique projections of the toes, at which anatomical landmark is the central
ray directed?
Answer: The Metatarsophalangeal (MTP) joint of the toe of interest.
