Question 1

What CR angle is required for the AP axial,inlet projection?

Accepted Answer

The answer of What CR angle is required for the...

Question 2

Less abduction of femora of only 20° to 30° from vertical provides for the least foreshortening of femoral necks when performing the AP bilateral "frog-leg" projection.

Accepted Answer

This statement is true. Less abduction of femora of only 20° to 30° from vertical provides for the least foreshortening of femoral necks when performing the AP bilateral "frog-leg" projection.

Question 3

Which of the following projections would be best for a patient with limited movement of both lower limbs (in addition to the AP pelvis)?

Accepted Answer

The modified axiolateral (Clements-Nakayama method) would be best for a patient with limited movement of both lower limbs because it allows for the least amount of movement by the patient while still providing visualization of the pelvic bones. The other projections listed require more movement by the patient and may be difficult or impossible for someone with limited lower limb mobility.

Question 4

A radiograph of an AP pelvis reveals that the right iliac wing is foreshortened as compared with the left side.What specific positioning problem is present on this radiograph?

Accepted Answer

Left rotation of the patient during an AP pelvis radiograph results in the right iliac wing appearing foreshortened compared to the left side, indicating that the patient's pelvis was rotated towards the left.

Question 5

A patient enters the ER having sustained trauma to the pelvis.The patient's main complaint is about her left hip.Which of the following projections should be taken first to rule out fracture or dislocation?

Accepted Answer

The AP pelvis projection should be taken first to evaluate for any fractures or dislocations in the pelvis, including the left hip. This projection will provide an overall view of the pelvis, allowing for a preliminary assessment of the extent of the injury. Once any significant pathology is identified, other projections can be taken to further evaluate the left hip specifically.

Question 6

How much rotation of the body is required for posterior axial oblique projection (Teufel method)?

Accepted Answer

For the posterior axial oblique projection (Teufel method), the body should be rotated approximately 35° to 40°. This allows the intervertebral foramina to be visualized without superimposition.

Question 7

What type of CR angle is required for the posterior axial oblique projection (Teufel method)?

Accepted Answer

The answer of What type of CR angle is required...

Question 8

A radiograph of an AP pelvis reveals that the lesser trochanters are not visualized.This pelvis projection was performed for nontraumatic reasons.What should the technologist do (if anything)to correct this on the repeat exposure?

Accepted Answer

The answer of A radiograph of an AP pelvis reveals...

Question 9

If a patient has excessive external rotation of one foot,a fractured hip may be indicated.

Accepted Answer

Excessive external rotation of one foot can be a sign of a fractured hip, as the affected leg may appear shorter and externally rotated due to displacement of the fractured bone.

Question 10

A PA axial oblique projection (Teufel method)is performed on a patient.The resultant radiograph demonstrates distortion of the acetabulum.The following positioning factors were used: 40° anterior oblique,12° cephalad CR angle,and CR centered to the upside hip (acetabulum).What needs to be modified during the repeat exposure?

Accepted Answer

The answer of A PA axial oblique projection (Teufel method)is...

Question 11

A radiograph of an axiolateral (inferosuperior)projection of the hip reveals a soft tissue artifact seen across the affected hip.This artifact prevents a clear view of the femoral head and neck.What must the technologist do to eliminate this artifact or its effect during the repeat exposure?

Accepted Answer

The answer of A radiograph of an axiolateral (inferosuperior)projection of...

Question 12

The proper name of the method used for the unilateral frog-leg projection is the _____ method.

Accepted Answer

The unilateral frog-leg projection, which is a radiographic technique used to view the hip in profile, is properly referred to as the modified Cleaves method.

Question 13

The image receptor must be placed parallel to the femoral neck for the axiolateral (inferosuperior)projection of the hip.

Accepted Answer

Yes, the image receptor must be placed parallel to the femoral neck for the axiolateral (inferosuperior) projection of the hip. This helps to accurately capture the position of the femoral head and neck.

Question 14

The posterior oblique (Judet method)for the acetabulum requires a 10° to 15° rotation of the body.

Accepted Answer

The posterior oblique (Judet method) for the acetabulum requires a 45° rotation of the body towards the affected side to visualize the posterior rim of the acetabulum.

Question 15

A nontrauma patient comes to radiology with a history of chronic pain of the right hip.The patient is ambulatory but has not had previous radiographs taken of that hip.Which of the following routines would be best suited for this patient?

Accepted Answer

The most appropriate routine for a nontrauma patient with chronic pain of the right hip who has not had previous radiographs taken of that hip would be the AP pelvis and axiolateral frog-leg (modified Cleaves) projections of the right hip. This combination allows visualization of both the hip joint and the pelvic bones, and the frog-leg position helps to separate the femoral head and neck for better visualization. The other options may not provide as comprehensive information or may be more appropriate for trauma patients.

Question 16

A radiograph of an axiolateral (inferosuperior)projection reveals that there is an excessive amount of grid lines present.A 6:1 linear grid was used.Which of the following points will correct this problem on the repeat exposure?

Accepted Answer

Excessive grid lines can occur if the image receptor is not aligned parallel to the grid lines. Keeping the image receptor parallel to the femoral neck and perpendicular to CR will ensure that the grid lines are not visible on the resultant image. Using a screen instead of a grid or decreasing the SID will not correct this problem. Keeping the image receptor perpendicular to the femoral neck will also not correct the problem because it does not address the issue of grid line visibility.

Question 17

A radiograph of an AP pelvis reveals that the left obturator foramen is more open or elongated as compared with the right.What is the specific positioning error present on this radiograph?

Accepted Answer

Right rotation causes the left obturator foramen to appear more open or elongated as compared with the right.

Question 18

Only a small part of the lesser trochanter,if any,will be visible on a well-positioned axiolateral (inferosuperior)lateral hip.

Accepted Answer

The lesser trochanter is located on the medial aspect of the femur and is typically not visible on an axiolateral (inferosuperior) lateral hip X-ray unless it is very prominent or there is a specific technique used to visualize it.

Question 19

Generally,gonadal shielding for females cannot be used for an initial AP pelvis for pelvic trauma due to the possibility of covering pertinent anatomy.

Accepted Answer

Gonadal shielding for females should not be used for an initial AP pelvis X-ray for pelvic trauma because it may cover important anatomy that needs to be evaluated. However, gonadal shielding can be used during subsequent X-rays once the pelvic anatomy has been evaluated.

Question 20

A radiograph of a unilateral frog-leg (modified Cleaves method)projection reveals that the femoral neck is foreshortened and distorted.The radiologist is concerned about pathology involving the neck.What can the technologist do to improve the visibility of the femoral neck without foreshortening during the repeat exposure?

Accepted Answer

Decreasing the abduction of the femur to 20° to 30° from vertical helps in reducing the foreshortening of the femoral neck, thus improving the visibility of the area of interest without distortion. This adjustment aligns the femoral neck more parallel to the direction of the X-ray beam, resulting in a more accurate representation of the femoral neck on the radiograph.

Quiz 7: Femur and Pelvic Girdle

What CR angle is required for the AP axial,inlet projection?

Less abduction of femora of only 20° to 30° from vertical provides for the least foreshortening of femoral necks when performing the AP bilateral "frog-leg" projection.

Which of the following projections would be best for a patient with limited movement of both lower limbs (in addition to the AP pelvis) ?

A radiograph of an AP pelvis reveals that the right iliac wing is foreshortened as compared with the left side.What specific positioning problem is present on this radiograph?

A patient enters the ER having sustained trauma to the pelvis.The patient's main complaint is about her left hip.Which of the following projections should be taken first to rule out fracture or dislocation?

How much rotation of the body is required for posterior axial oblique projection (Teufel method) ?

What type of CR angle is required for the posterior axial oblique projection (Teufel method) ?

A radiograph of an AP pelvis reveals that the lesser trochanters are not visualized.This pelvis projection was performed for nontraumatic reasons.What should the technologist do (if anything) to correct this on the repeat exposure?