X-RAY OF COCCYX
X-ray Coccyx A/P View
Coccyx AP
Region: coccyx
Pathology: fracture and dislocation of coccyx
SID: 100 cm (40 inches)
Central Ray: beam directed to the point 5 cm (2 inches) superior to the pubic symphysis with 10˚ caudal angulation
Respiration: suspended
Position:
1. The patient is placed in a supine position.
2. Align the patient's midsagittal plane at the center of image receptor (IR).
3. Patient's body and pelvis should
not be in rotated.
Collimation: Sacrum and coccyx must be included.
Evaluation:
1. Coccygeal segments should not overlap on one another.
2. Coccyx must
be shown at the same level with the bilateral pevic walls at the center of the
radiation field.
kVp-92, mAs-8
Tip:
1. Apply shielding to genital gland not to be covered by inspecting area.
2. For women, genital gland overlap with inspecting area, so shielding is
impossible.
3. If the curve of coccyx is
big, coccygeal segment
shows in stack. At this time, projection angle of Central X-ray should
increase.
4. Before this inspection, urine in bladder should be empty and intestinal gas
or stool should be removed.
5. In prone position, project 10° cephalad.
Coccyx Lateral
Region: coccyx
Pathology: fracture and dislocation of coccyx
ISID: 100 cm (40 inches)
Central Ray: perpendicular beam directed at the point 8 to 10cm (3~4 inches) posterior and 5 cm (2 inches) inferior to the anterior superior iliac spine (ASIS)
Respiration: suspended
Position:
1. The patient is placed in a lateral decubitus position.
2. Place the point 3~4cm above femoral greater
trochanter at the center of image receptor (IR).
3. Flex hips and knees and place a support under knees and ankles.
Collimation: Sacrum and coccyx must be included.
Evaluation:
1. Coccygeal segments should not overlap on one another.
2. Coccyx in
true lateral should be shown at the center of image.
3. Femoral head should overlap on one another.
kVp-90, mAs-55
Tip:
1. Apply shielding to genital gland not to be covered by
inspecting area.
2. Place lead plate on patient's back side to prevent decline of subject
contrast from scattered rays.
