Veterinary Radiography Ch 16

1.

Which of the following is true?

A.

Any positioning device(s) superimposed on an area of interest must be radiodense.
B.

Any positioning device(s) superimposed on an area of interest must be radiolucent.
C.

Disk spaces must be near parallel to the table top for a diagnostic radiograph of the vertebral column.
D.

Using positioning devices under the thoracolumbar area is usually necessary for a lateral view of the spine.

Correct Answer
B. Any positioning device(s) superimposed on an area of interest must be radiolucent.

Explanation
The correct answer is that any positioning device(s) superimposed on an area of interest must be radiolucent. This means that the device should allow X-rays to pass through it, so that it does not obstruct the view of the area being imaged. Using radiolucent devices ensures that the image obtained is clear and accurate, without any interference from the positioning device.

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2.

What is the field of view for the cervical spine?

A.

Base of the skull, entire cervical spine, and first few thoracic vertebrae
B.

Base of the skull and first few thoracic vertebrae
C.

Base of the skull and cervical vertebrae
D.

Skull, cervical vertebrae, and first few thoracic vertebrae

Correct Answer
A. Base of the skull, entire cervical spine, and first few thoracic vertebrae

Explanation
The field of view for the cervical spine includes the base of the skull, the entire cervical spine, and the first few thoracic vertebrae. This means that when viewing the cervical spine, one would be able to see the area from the base of the skull down to the upper part of the thoracic spine.

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3.

Where is the measurement taken for a hyperextended lateral view of the cervical spine?

A.

CS-6
B.

C6-7
C.

T2-3
D.

T-1 (thoracic inlet)

Correct Answer
D. T-1 (thoracic inlet)

Explanation
The measurement for a hyperextended lateral view of the cervical spine is taken at the thoracic inlet, specifically at the level of T-1. This is the area where the cervical spine transitions into the thoracic spine.

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4.

What indicates that a thoracic radiograph is in a true ventrodorsal position?

A.

Humeri are parallel.
B.

The heart is parallel on either side of the thoracic spine
C.

The sternum is superimposed over the thoracic spine
D.

The sixth rib is superimposed over the scapulo- humeral joint.

Correct Answer
C. The sternum is superimposed over the thoracic spine

Explanation
A thoracic radiograph is considered to be in a true ventrodorsal position when the sternum is superimposed over the thoracic spine. This means that the sternum is directly aligned with the spinal column, indicating that the patient was positioned correctly for the X-ray. This alignment ensures that the internal structures of the thoracic region are accurately captured on the radiograph.

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5.

Which of the following is true?

A.

For a flexed lateral view of the cervical spine, the head should be pulled cranially.
B.

For an extended lateral view of the cervical spine, the head should be pulled caudally.
C.

For a flexed lateral view of the cervical spine, the head is pulled caudally.
D.

For an extended lateral view of the cervical spine, the head is extended rostrally.

Correct Answer
C. For a flexed lateral view of the cervical spine, the head is pulled caudally.

Explanation
In a flexed lateral view of the cervical spine, the head is pulled caudally. This means that the head is positioned in a downward direction, towards the tailbone. This positioning helps to align the cervical spine properly for imaging purposes. The flexed position allows for better visualization of the cervical vertebrae and helps to reduce overlap of the structures. By pulling the head caudally, the radiologist or technician can obtain a clear and accurate image of the cervical spine in a flexed position.

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6.

Where should the measurement be taken for a lateral view of the thoracic spine?

A.

Seventh thoracic vertebra
B.

Sixth thoracic vertebra
C.

Eighth thoracic vertebra
D.

Thickest area of the thorax

Correct Answer
A. Seventh thoracic vertebra

Explanation
The measurement for a lateral view of the thoracic spine should be taken at the seventh thoracic vertebra. This is because the seventh thoracic vertebra is the most prominent landmark on the spine and is easily identifiable for accurate measurement.

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7.

Which vertebrae must be included in a ventrodorsal view of the thoracolumbar spine?

A.

Tll-L3
B.

Tll-L2
C.

T12-L2
D.

All of the thoracic and lumbar vertebrae

Correct Answer
D. All of the thoracic and lumbar vertebrae

Explanation
In a ventrodorsal view of the thoracolumbar spine, all of the thoracic and lumbar vertebrae must be included. This means that the view should include the vertebrae from T1 to L5. The thoracic vertebrae are located in the upper back region and the lumbar vertebrae are located in the lower back region. Including all of these vertebrae in the view ensures a comprehensive examination of the thoracolumbar spine.

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8.

How should the rear limbs be positioned during a lateral lumbar view?

A.

Pulled cranially
B.

Pulled caudally
C.

Frog-leg
D.

The limb closest to the cassette is pulled slighdy cranially

Correct Answer
B. Pulled caudally

Explanation
In a lateral lumbar view, the rear limbs should be positioned pulled caudally. This means that the limbs should be pulled towards the tail or in a downward direction. This positioning allows for better visualization of the lumbar vertebrae and helps to minimize overlap of the hind limbs on the radiograph.

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9.

At what angle should the x-ray tube be positioned for a ventrodorsal view of the sacrum?

A.

30 degrees toward the tail
B.

20 degrees toward the head
C.

30 degrees toward the head
D.

40 degrees toward the tail

Correct Answer
C. 30 degrees toward the head

Explanation
The x-ray tube should be positioned at a 30-degree angle toward the head for a ventrodorsal view of the sacrum. This angle allows for optimal visualization of the sacrum from the ventral (front) to dorsal (back) direction. It ensures that the x-ray beam passes through the sacrum at the correct angle, providing clear and accurate images of this area.

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10.

Where should the cassette be placed for a ventro- dorsal view of the caudal spinal?

A.

Under the sacrum
B.

In the Bucky tray
C.

On the tabletop
D.

Perpendicular to the table top

Correct Answer
C. On the tabletop

Explanation
The cassette should be placed on the tabletop for a ventro-dorsal view of the caudal spinal.

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