click below
click below
Normal Size Small Size show me how
rad exams
Extremity x-ray review
Question | Answer |
---|---|
Where do you center the CR for the toes? | 3rd MTP joint |
Where do you center for almost all foot projections? | Base of the third metatarsal |
Where do you center the CR for a tangential projection of the sesmoids? | perpendicular the first MTP joint |
Where do you center the CR for an Axial plantodorsal projection of the calcaneus? | 40 degrees cephalic at the the base of the third metatarsal |
Where do you center the CR for an Axial dorsoplantar projection of the calcaneus? | 40 degrees caudad at the dorsal surface of the ankle joint |
Where do you center for the lateral projection of the calcaneus? | 1" distal to the medial malleolus |
What kind of fracture is demonstrated in a mediolateral projection of the ankle? | jones fracture: fx of the 5th metatarsal base |
A lateral oblique projection demonstrates what? | The superior aspect of the calcaneus |
Inversion stress of the ankle shows? | rupture of lateral ligament |
Eversion stress of the ankle shows? | medial ligament |
The CR is directed where for an AP projection of the Knee on a patient with a thin pelvis thickness of less than 18 cm? | 3-5 degrees caudad 1/2 inferior to the patellar apex |
The CR is directed where for an AP projection of the Knee on a patient with a pelvis thickness of less than 19-24 cm? | perpendicular 1/2 inferior to the patellar apex |
The CR is directed where for an AP projection of the Knee on a patient with a large pelvis thickness of 25 cm and above? | 3-5 degrees cephalic inferior to the patellar apex |
Where is the CR directed for a PA projection of the knee? | 5-7 degrees caudad 1/2" inferior to the patellar apex |
How many degrees do you flex the knee on a lateral projection to visualize optimum joint space? | 20-30 degrees |
Where do you center the CR for a Lateral Projection of the knee? | 5-7 degrees cephalic 1" distal to medial epicondyle |
What does the weight bearing projection of the kneed show? | joint spaces |
Where is the fibula and patella viewed on lateral oblique projection of the knee? | superimposed on the lateral half of femur and tibia? |
What is shown on a medial oblique of the knee? | tibiofibular joint space and fibula head |
For a PA Axial projection of the intercondylar fossa how many degrees do you flex the knee? | 70 degrees |
For a PA Axial projection of the intercondylar fossa where do you center the CR? | Perpendicular to the lowerleg entering the midpoint of the ir |
For a lateral projection of the patella how much do you flex the knee? | 5-10 degrees |
How do you position a patient for a PA projection of the patella? | prone with heel rotated 5-10 degrees laterally with CR entering mid popliteal area |
Using the merchant method how many degrees do you flex the knees? | 40 degrees |
Where is the CR directed when using the merchant method | 30 degrees caudad entering the patellofemoral joint |
Where do you direct the CR for the Settegast method? | depending on knee angulation usally 15-20 degees cephalic entering knee joint space |
How do you position the patient and the IR for an AP projection of the proximal femur? | Place IR at the level of the ASIS to include the hip joint and rotate the limb 15-20 degree internally to place femoral necks in profile |
How do you position the patient and the IR for an AP projection of the distal femur? | place IR 2" below knee joint and rotate limb internally a little to place epicondyles parallel with IR |
How do you position the patient and the IR for a lateral projection of the distal femur? | place IR 2" below the knee adjust patient and pelvis to a true lateral postion, flex knee 45 degrees and place epicondyle perpendicular to the IR |
How do you position the patient and the IR for a lateral projection of the proximal femur? | place patient on side, place the IR @ the level of the ASIS and adjust pelvis 10-15 degrees posteriorly to prevent superimposition |
Where do you center the CR for a PA projection of the Hand? | 3rd MCP joint |
Where you center the CR for the lateral projection of the hand | 2nd MCP joint |
Where do you center the CR for a finger? | To the PIP joint of the affected digit? |
Where do you center the CR for a thumb? | TO the MCP joint |
Where do you center the CR for a lateral projection of a toe? | TO PIP joint |
Where do you center the CR for PA Wrist? | Midcarpal area |
Where do you center the Cr for a Lateral Wrist? | Perpendicular to the wrist joint |
To demonstrated the scaphoid who do you position your hand? | in ulnar deviation, this corrects foreshortening |
How is the CR directed for PA scaphoid projection? | perpendicular to scaphoid and sometimes angled 10-15 degrees to clear delineation |
What is the stecher method? | 20 degrees angulation of wrist or CR directed 20 degrees cephalic at scaphoid |
How do you x-ray the carpal canal? | with wrist stressed the central ray enters the hand 20-35 degrees toward forearm or tangential view where the CR enters perpendicular to the midpoint of the wrist |
How do you position the arm for a medial oblique projection of the elbow? | extend limp in AP position and then pronate hand? |
What does the medial oblique projection of the elbow show? | The coronoid process |
How do you position the arm for a lateral oblique elbow? | rotate the arm 45 degrees laterally |
What does the lateral oblique projection of the elbow show? | The radial head, neck and tuberosity free from superimposition |
When is the coyle method used? | When the patient can not extend arm in oblique positions to demonstrate the coronoid process and radial head |
For the axiolateral projection of the elbow where do you direct the CR to demonstrate the radial head | 45 degrees cephalic at the elbow |
For the axiolateral projection of the elbow where do you direct the CR to demonstrate the coronoid process | 45 degrees caudad at the elbow |
How do you postion the patient and IR for an upright AP projection of the humerus? | Place IR 1 1/2" above the head of the humerus, abduct arm and supinate hand, make sure epicondyles are a parallel with IR |
How do you position the patient for a lateral projection of the humerus? | Flex arm 90 degrees and place anterior hand on hip |
Where do you cent the CR for the shoulder? | 1" inferior to the coracoid process |
In the external rotation of the shoulder what is seen? | the greater tubercle in profile |
In the internal rotation of the shoulder what is seen? | the lesser tubercle in profile |
Where do you center the CR on posterior oblique of the shoulder (grashey)? | 2" inferior and 2" medial to superolateral border of shoulder |
How do you position a patient for a transthorcic lateral projection of the shoulder? | turn patient laterally, affected arm down and unaffected arm raised above head. |
Where is the CR centered on trasthoracic projection of the shoulder? | entering the midcoronal plane at the level of the surgical neck |
What do you do if the patient can not elevate the unaffected arm for a transthoracic projection of the shoulder? | angle the CR 10-15 cephalic |
What breathing technique is used for a transthoracic view of the shoulder | full inspiration or slow deep breathing |
What does the inferosuperior axial projection of the shoulder show? | hill-sachs defect: wedge shaped compression fx |
How do you postion the patient for an inferosuperior axial projection of the shoulder? | supine, externally rotate arm, and abduct arm |
How do you position a patient for a scapular Y view? | RAO or LAO with affected arm centered, 45-60 degree oblique |
What does the scapular Y view show? | an oblique shoulder or dislocations |
Where do you center the CR for scapular Y view? | at the scapulohumeral joint |
Where do you direct the CR for an AP axial view of the clavicle? | 0-15 degrees for the standing lordotic and 15-30 degrees for the supine position |
Where do direct the CR for a PA projection of the clavicle? | 15-30 caudad |
How do you position a patient for the AP scapula projection? | upright or supine with the arm raised with elbow flexed |
What breathing technique is used for the AP scapula projection? | Slow breathing to obliterate lung detail |