chapter 4
a less than optimal lateral elbow projection demonstrating the capitulum posterior to the medial trochlea will
be obtained when the distal forearm is elevated
a right lateral 4th finger projection obtained with the hand internally rotated to 20* demonstrates
greater phalangeal midshaft concavity on the side facing the 3rd finger
a PA axial, ulnar-deviated wrist projection with poor positioning demonstrates a closed scaphocapitate joint and an open hamate-capitate joint. how should the positioning setup be adjusted for an optimal image to be obtained
increase the degree of external wrist rotation
which of the following technical factors should be chosen when 20mAs is desired and the patient being imaged has difficulty remaining still
400mA at 0.05 sec
which side of the arm is positioned against the IR for the 4th lateral finger projection
ulnar
to take advantage of the anode heel effect when imaging a forearm
the wrist is positioned at the anode end of the x-ray tube
when the patient ulnar-deviates for a PA axial, ulnar-deviated wrist projection, the
-1st metacarpal and radius are aligned -lunate is demonstrated distal to the radius -distal scaphoid shifts posteriorly
a PA wrist projection obtained in slight external rotation demonstrates
-a closed radioulnar articulation -open lateral carpal joint
a lateral elbow projection obtained with the wrist and hand pronated demonsrtates
-an open elbow joint -the radial tuberosity in profile posteriorly
a lateral elbow projection with accurate positioning demonstrates
-an open elbow joint space -the radius superimposing the radial tuberosity -the anterior fat pad
a PA wrist projection with accurate positioning demonstrates
-an open radioulnar articulation -the radial styliod in profile laterally -the long axes of the 3rd metacarpal aligned with the midforearm -open the 2nd through 5th CM joint spaces
the IP joint spaces on finger projections are open and demonstrated without distortion when the
-central ray is aligned parallel to the IP joint spaces -IP joints are aligned perpendicular with the IR
a lateral wrist projection obtained with the wrist in slight internal rotation demonstrates the
-distal scaphoid anterior to the pisiform -radius anterior to the ulna
a properly positioned tangential projection of the wrist will demonstrate which of the following
-flexor retinaculum anteriorly and the capitate posteriorly -scaphoid and trapezium laterally -pisiform and hamate medially
a PA hand projection obtained with the hand flexed demonstrates
-foreshortened phalanges -the thumb in a lateral position -closed IP joint spaces -foreshortened metacarpals
sharply recorded details are demonstrated on extremity images when
-motion is controlled -a small IR is used for computed radiography images
a lateral forearm projection obtained in a patient with the proximal humerus elevated and the wrist internally rotated demonstrates the
-radial head posterior to the coronoid processes -radius visible anterior to the elbow
a lateral hand projection obtained with the hand in slight external rotation demonstrates
-shortest of the 2nd through 4th metacarpals anteriorly situated -radius posterior to the ulna -2nd metacarpal posterior to the other metacarpals
a lateral wrist projection obtained with the elbow flexed 90* and the humerus placed parallel with the IR demonstrates
-superimposition of the radius and ulna -superimposition of the distal scaphoid and pisiform -the ulnar styloid in profile
a lateral elbow projection demonstrates the radial head situated anterior and proximal to the coronoid process. how was the patient positioned for such an image to be obtained
-the distal forearm was too high -the proximal humerus was too low
a lateral forearm projection with accurate positioning demonsrates
-the distal scaphoid and the pisiform are aligned -the ulnar styloid in profile -an open elbow joint space
PA wrist projection obtained in radial deviation demonstrates
-the lunate positioned distal and medial to the ulna -a foreshortened scaphoid
an AP elbow projection with accurate positioning demonstrates
-the medial and lateral humeral epicondyles in profile -the radial tuberosity in profile medially -an open capitulum-radial joint
a lateral elbow projection obtained with the distal forearm positioned too low and the proximal humerus positioned to high demonstrates the
-the radial head distal and posterior to the coronoid process -capitulum anterior and distal to the medial trochlea
a PA wrist projection obtained with the wrist in a neutral position demonstrates
-the scaphoid in partial foreshortening -the center of the lunate positioned distal to the radioulnar articulation -alignment of the long axis of the 3rd metacarpal and radius
A lateral elbow projection obtained with the wrist and internal demonstrates: 1. The radial head anterior to the coronoid. 2. The radial tuberosity in profile anteriorly. 3. an open elbow joint. 4. the radial tuberosity in profile posteriorly.
...
what is the central ray angulation used for the PA axial, ulnar-deviated wrist projection: a scaphoid wrist fracture is suspected, and the patient is able to ulnar-deviate until the 1st metacarpal and radius are aligned
15*
how is a patient positioned for a PA wrist projection to superimpose the anerior and posterior margins of the distal radius and obtain open radioscaphoid and radiolunate joint spaces
depress the proximal forearm
a less than optimal ulnar-deviated PA axial (scaphoid) wrist projection demonstrates closed scaphotrapezium, scaphotrapezoidal, and CM joint spaces. how should the positioning setup be adjusted to obtain an optimal projection
extend the hand, positioning it flat against the I and externally rotate the wrist
a PA oblique wrist projection with poor positioning demonstrates an obscured trapeziotrapeze joint space and excessive trapazoid and capitate superimposition. how should the positioning setup be adjusted for an optimal image to be obtained
internally rotate the wrist
An IR that is large enough to extend at least 1 inch beyond the elbow and wrist joints for a forearm projection is
needed to record the elbow and wrist on the image.
what is the projection for the lateral finger
phalanges demonstrate concavity on one side and convexity on the other side
which side of the are is positioned against the IR for the lateral 2nd finger projection
radial
which of the following is not true about an optimal axiolateral elbow projection (Coyle method)
the capitulum and medial trochlea demonstrate slight superimposition
a tangential inferosuperior carpal canal wrist projection with accurate positioning demonstrates
the carpal canal
a less than optimal PA wrist projection demonstrates an elongated scaphoid and the 2nd through 4th metacarpals superimposing the CM joint spaces. which of the following is true about this projection
the hand was overflexed
an optimal AP elbow projection is obtained when
the radial head superimposes the lateral aspect of the proximal ulna by 0.25 inches
a less than optimal AP elbow projection demonstrating the ulna without radial head superimposition
was obtained with the elbow in external rotation
