Select the following purposes for panoramic imaging.

The movement of the receptor and the tubehead produces an image through the process known as:

1. The closer the rotation center is to the teeth, the narrower the focal trough.

2. In most panoramic x-ray machines, the focal trough is narrow in the anterior region and wide in the posterior region.

1. A real image is a "true" image because it appears in the correct anatomic location with varying degrees of sharpness and distortion.

2. Structures found within the focal trough appear sharp on the resultant image while structures outside of the focal trough appear blurred.

The tubehead of the panoramic unit always rotates behind the patients head, while the receptor rotates in front of the patient.

What 2 things are only required in film-based panoramic imaging?

Select the types of intensifying screens:

1. Calcium tungstate screens emit blue light.

2. Rare earth screens emit green light.

1. Rare earth screens require less x-ray exposure than do calcium tungstate screens, and are considered faster.

2. Rare earth is preferred because of the less radiation exposure to the patient.

The dental radiographer must complete the panoramic imaging equipment preparations before preparing the patient for exposure.

The following are the equipment preparation steps for panoramic imaging:

1. Prepare the receptor

2. Prepare the bite-block

3. Choose exposure settings

4. Adjust machine height

With digital imaging, an overexposed image can be corrected with the use of software, but an underexposed image cannot.

Select the 2 most common patient preparation errors.

This positioning problem will result in a radiolucent shadow that obscures anterior teeth. This area of increased darkness occurs over the maxillary anterior region, and may be mistaken for bone loss.

This positioning problem will result in a dark radiolucent shadow that obscures the apices of the maxillary teeth.

What type of positioning problem causes anterior teeth to appear "skinny" and out of focus on the image?

This is caused by being too far forward on the bite stick.

What type of positioning problem causes anterior teeth to appear "fat" and out of focus on the image?

This is caused by being too far back on the bite stick.

Select the advantages of panoramic imaging:

Select the disadvantages of panoramic imaging:

You should position the midsagittal plane of the patient perpendicular to the floor.

The panoramic image should not be used to diagnose:

Which of the following describes a use of a panoramic image?

The zone in which structures are clearly demonstrated on a panoramic image is termed:

Rare earth intensifying screens are recommended in panoramic imaging because:

A thyroid collar is not recommended in panoramic imaging because:

The imaging line that passes from the bottom of the eye socket through the top of the ear canal is termed:

The receptor and the tubehead rotate around the patient.

This type of image is used to examine the extent of large lesions.

The tubehead contains a filament used to produce electrons and a target used to produce x-rays.

The collimator is a lead plate with an opening in the shape of a narrow vertical slit.

The vertical angulation of the tubehead is variable.

A screen film is used.

The vertebral column must be perfectly straight.