Question 1

The top of the foot is placed against the image receptor with the perpendicular central ray entering the sole of the foot.What specific projection has been performed?

Accepted Answer

The plantodorsal projection is performed with the top of the foot (plantar surface) placed against the image receptor and the central ray perpendicular entering the foot from the dorsal surface.

Question 2

The amount of blackness seen on a processed radiograph is called:

Accepted Answer

The amount of blackness seen on a processed radiograph is referred to as density. Fog refers to a general haziness or lack of clarity in the radiograph, while scatter refers to the deflection of radiation as it passes through the body. Contrast refers to variations in brightness between different areas of the radiograph.

Question 3

What is the minimal number of projections taken for a study of the knee?

Accepted Answer

Three projections are typically taken for a study of the knee: AP (anterior-posterior), lateral, and oblique. These projections provide different views of the knee joint and can help in the diagnosis of various conditions. One or two projections may not provide enough information, while more than three may not be necessary in most cases.

Question 4

What is the final step taken before making the exposure during a positioning routine?

Accepted Answer

The answer of What is the final step taken before...

Question 5

It is common practice to view a PA projection with the patient's left facing the viewer's right.

Accepted Answer

This is true because anatomical structures are conventionally labeled from the perspective of the patient, not the viewer.

Question 6

A patient is erect with his left side of the chest placed against the image receptor.The central ray enters the left side of the upper chest and exits the right.Which specific position has been performed?

Accepted Answer

This position is a transthoracic lateral, since the patient is standing and the central ray is entering one side of the chest and exiting the other. The dorsal decubitus position would have the patient lying on their back with the chest exposed. The right lateral position would have the patient facing the image receptor with the right side of the chest closest to the receptor, while the ventral decubitus position would have the patient lying on their stomach with the chest exposed.

Question 7

When placing radiographs of the hand on the view box,the digits should be pointing upward.

Accepted Answer

The digits (fingers) of the hand should be pointing upward when placing radiographs on the view box, as this is the standard orientation for evaluating the anatomy and pathology of the hand.

Question 8

When placing radiographs of the lower leg,the toes of the foot must be pointing upward.

Accepted Answer

When taking radiographs of the lower leg, the toes should be pointing downward or in a neutral position to properly align the anatomy for accurate imaging.

Question 9

What is the minimal number of projections taken for a postreduction (to realign a fracture)study of the ankle?

Accepted Answer

Two projections are necessary for a postreduction study of the ankle. A lateral projection is needed to evaluate the lateral malleolus and a mortise (AP oblique) projection is needed to evaluate the medial malleolus and the integrity of the ankle mortise.

Question 10

What is the minimal number of projections taken for a study of the right hip?

Accepted Answer

Two projections, an AP view and a lateral view, are typically sufficient to study the right hip. This allows for visualization of the entire joint, including the femoral head and neck, acetabulum, and greater trochanter. Additional oblique or specialized views may be obtained if necessary based on the clinical question or suspected pathology.

Question 11

The patient is lying on her right side on a cart.The anterior surface of the patient is against the image receptor.A horizontal central ray enters the posterior surface and exits the anterior surface of the body.What specific projection/position has been performed?

Accepted Answer

The description matches a right lateral decubitus position, where the patient lies on their right side, and the image is taken horizontally. This position is used to show fluid levels or air accumulation in the body that wouldn't be visible in a standard upright position.

Question 12

The patient's head and neck are hyperextended with the top of the skull directly against the image receptor.The central ray enters just below the chin.Which specific projection has been performed?

Accepted Answer

The description given matches the positioning for a submentovertical projection, which is used to visualize the base of the skull or sphenoid bone.

Question 13

Decubitus chest projections are placed for viewing the way the image receptor "sees" them.

Accepted Answer

Decubitus chest projections are positioned based on the patient's position (lying on their side) rather than how the image receptor "sees" them. The term "decubitus" refers to the patient's position during the x-ray, not the orientation of the image receptor.

Question 14

A patient is erect facing the x-ray tube and leaning the shoulders backward 20° to 30° toward the IR.The central ray is perpendicular to the IR.What specific position has been performed?

Accepted Answer

The patient is erect and facing the x-ray tube, but leaning the shoulders backward 20° to 30° toward the IR. This position is called Lordotic and is commonly used to image the lungs and apices of the chest. The central ray is perpendicular to the IR, which means it is directed straight at the IR.

Question 15

When viewing a CT (computed tomography)or MRI (magnetic resonance imaging)image,the patient's right is facing the viewer's left.

Accepted Answer

This is true in radiology convention. It is called the "radiological convention" and is a standard way of interpreting images for consistency and clarity.

Question 16

Which of the following radiographic procedures often only requires a single AP projection be taken?

Accepted Answer

The answer of Which of the following radiographic procedures often...

Question 17

Which of the following factors primarily controls radiographic density in the analog image?

Accepted Answer

The mAs (milliamperage-seconds) setting primarily controls radiographic density in the analog image. The higher the mAs, the more x-rays are produced and the darker the film appears. The other answer choices (kV, film-screen speed, and OID) do not have as direct of an impact on radiographic density in the analog image.

Question 18

Which of the following is NOT one of the four image quality factors of an analog radiograph?

Accepted Answer

The four image quality factors of an analog radiograph are contrast, detail, distortion, and density. Source image receptor distance (SID) is not considered a primary image quality factor, although it can affect image quality in terms of magnification and spatial resolution.

Question 19

PA or AP oblique projections are placed on the view box with the patient's right side of the body facing the viewer's right.

Accepted Answer

PA or AP oblique projections are placed on the view box with the patient's left side of the body facing the viewer's right.

Question 20

What is the minimal number of projections taken for a study of the femur?

Accepted Answer

Two projections are typically taken for a study of the femur - an AP view and a lateral view.

Quiz 1: Terminology, Positioning, and Imaging Principles