1411 Unit 2 WB Positioning of the Chest

To prevent the clavicles from obscuring the apiceson a AP projection of the chest, the central ray should be angled __________ so that it is perpendicular to the ___________

Caudad (+/- 5 degrees), sternum

An erect chest PA radiograph aids the patient to achieve full inspiration and helps to prevent ____________ and _____________ of the pulmonary vessels.

Engorgement, hyperemia

T/F A grid is not recommended for an LPO projection of the adult chest

False

T/F No lead shielding is necessary for male patient or women older than age 65 during a radiographic imaging of the chest

False

How much separation of the posterior ribs on a lateral chest projection indicates excessive rotation from a true lateral position?

Greater than 1 cm (1/2 to 3/4 inch)

Which posterior oblique projection would best demonstrate the left lung?

LPO

Which specific position would be used if a patient were unable to stand but the physician suspected that the patient had fluid in the left lung?

Left lateral decubitus

For certain studies of the heart, the ________ anterior oblique requires a rotation of ___________

Left, 60°

What are the recommended patient instructions when performing an erect PAchest on a female patient with large pendulous breasts?

Lift the breasts up and outward and then remove her hands as she leans against the chest board (IR) to keep them in position

Why is a PA preferred to an AP chest projection?

Places the heart closer to the image receptor to reduce magnification of the heart

What is the name of the condition characterized by fluid entering the plural cavity?

Pleural effusion

What is the name of the condition characterized by free air entering the plural cavity?

Pneumothorax

Which anterior oblique projection would best demonstrate the left lung?

RAO

Which specific position would be used if the patient were unable to stand but the physician suspected that the patient had free air in the pleural cavity?

Right lateral decubitus (affected side up)

What circumstances or clinical indications suggest that in an AP lordotic projection should be ordered?

Rule out calcifications or masses beneath the clavicles

The shoulders need to be rolled forward for the PA projection to allow the _________________ to move laterally and be clear of the lung fields

Scapulae

Careful collimation during a chest radiograph will improve image quality by decreasing ______________ radiation time the IR

Scatter

The CR is placed at the level of the __________ vertebra for a PA chest projection

T7

Where is the central ray placed for a lateral projection of the upper airway?

level of C6-C7, midway between thyroid cartilage and jugular notch

Why should a left lateral be performed unless departmental protocol indicates otherwise?

A left lateral better demonstrates the heart region

What position/projection would be used for a patient who is too ill or weak to stand for in an AP lordotic projection?

AP semiaxial projection, central ray 15 to 20 degrees cephalad