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Questions and Answers
What is the main purpose of collimating to include the greater trochanters, lesser trochanters, and the iliac crests in an AP Pelvis Radiograph?
What is the main purpose of collimating to include the greater trochanters, lesser trochanters, and the iliac crests in an AP Pelvis Radiograph?
- To achieve proper rotation of the proximal femora
- To reduce the radiation dose to the patient
- To ensure the entire pelvis and proximal femora are included in the image (correct)
- To visualize the sacroiliac joint and the lower vertebral column
What is the correct alignment of the sacrum and coccyx in an AP Pelvis Radiograph?
What is the correct alignment of the sacrum and coccyx in an AP Pelvis Radiograph?
- Aligned with the obturator foramina
- Aligned with the pubic symphysis (correct)
- Aligned with the iliac crests
- Aligned with the ischial spines
What is the purpose of including the iliac crest in an AP Pelvis Radiograph?
What is the purpose of including the iliac crest in an AP Pelvis Radiograph?
- To achieve proper rotation of the proximal femora
- To ensure the entire pelvis is included in the image (correct)
- To visualize the sacroiliac joint
- To reduce the radiation dose to the patient
What is the correct appearance of the obturator foramina in an AP Pelvis Radiograph?
What is the correct appearance of the obturator foramina in an AP Pelvis Radiograph?
What is the purpose of centering the lower vertebral column to the middle of the radiograph in an AP Pelvis Radiograph?
What is the purpose of centering the lower vertebral column to the middle of the radiograph in an AP Pelvis Radiograph?
What is the correct position of the greater trochanter in an AP Pelvis Radiograph?
What is the correct position of the greater trochanter in an AP Pelvis Radiograph?
What is the purpose of including the ASIS in an AP Pelvis Radiograph?
What is the purpose of including the ASIS in an AP Pelvis Radiograph?
What is the correct criterion for evaluating the rotation of the pelvis in an AP Pelvis Radiograph?
What is the correct criterion for evaluating the rotation of the pelvis in an AP Pelvis Radiograph?
What is the purpose of achieving proper rotation of the proximal femora in an AP Pelvis Radiograph?
What is the purpose of achieving proper rotation of the proximal femora in an AP Pelvis Radiograph?
What is the correct position of the lesser trochanter in an AP Pelvis Radiograph?
What is the correct position of the lesser trochanter in an AP Pelvis Radiograph?
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Study Notes
Sacroiliac Joints Oblique Projection
- Cassette: Portrait, Grid: Yes, SID: 100cm, kVp: **, mAs: **, Focal spot size: Large
- Patient position: Supine, 15° to 25° posterior oblique (side of interest elevated), support patient's knees
- CR: Centre 2.5 cm medial to the ASIS on the side being examined (raised side), central ray perpendicular to the cassette
Image Evaluation Criteria for Sacroiliac Joints Oblique Projection
- Proper degree of obliquity evident by an open and uniform SI joint space
- Soft tissue and bony trabecular detail
AP Pelvis Supine Projection
- Cassette: Portrait, Grid: Yes, SID: 100cm, kVp: **, mAs: **, Focal spot size: Large
- Positioning: Patient lies supine with midsagittal plane (MSP) centered to midline of table
- Arms placed at patient's sides away from body, provide pillow for head, and ensure pelvis is not rotated
- Internally rotate affected leg 15° to 20°
Centering Point for AP Pelvis Supine Projection
- Between the ASIS and a line joining the greater trochanters
- Ensure iliac crest is included at the top of the image
- Collimate to include the greater trochanters, lesser trochanters, and the iliac crests
Image Evaluation Criteria for AP Pelvis Supine Projection
- Entire pelvis and proximal femora included
- Lower vertebral column centered to the middle of the radiograph
- No rotation of pelvis (both ilia symmetric in shape, symmetric obturator foramina, ischial spines equally seen, sacrum and coccyx aligned with the pubic symphysis)
- Proper rotation of proximal femora, greater trochanters in profile, lesser trochanters
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