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Chest Positioning

Chest PositioningAnswers
Why is the patient placed in an upright position when x-raying the heart and lungs? To prevent engorgement of the pulmonary vessels and to allow gravity to depress diaphragm.
Which lateral chest image (left or right) is most commonly used? Left
In a PA projection of the chest, the central ray is directed to what level? T7
During x-ray of the lungs, the diaphragm moves to its lowest position when? Erect inspiration
Rotation on a PA chest x-ray can be detected by evaluating what? Sternoclavicular joints
How many ribs should be seen on an adult chest x-ray? 10
When performing a frontal projection of the chest, why is the PA projection preferred? It places the heart closest to the IR
Why is the right side of the lung base higher than the left? Because of the presence of the liver.
Is the posterior aspect of the ribs higher than the anterior aspect? Yes
How many degrees should a patient be rotated for a PA oblique projection of the chest evaluating the lungs? 45 degrees
Where should the CR be directed/centered for a lateral projection? Perpendicular to the midline of the IR, at the level of T7.
Where is the midsagittal plane placed for a lateral projection? The MSP should be parallel with the plane of the IR.
What body plane should be perpendicular and centered to the midline of the IR? Midcoronal
With a PA Oblique projection, which side (the one closer or farther) is generally the side of interest? The one farthest from the IR.
Which side of the chest (left or right) is of primary interest with the PA oblique projection, RAO? Left side
When performing the PA oblique projection, RAO position, how many degrees should the patient be rotated? 45 degrees
When performing the PA oblique projection, LAO position, how many degrees should the patient be rotated? 55 to 60 degrees
Which AP oblique projection produces an image similar to that produced by the PA oblique projection, RAO position? AP oblique projection, LPO position
In a AP Axial (Lordotic) projection, which portion of the lung is generally the area of interest? Apex
In a AP Axial (Lordotic) projection, where should the CR enter the patient? Midsagittal plane, on the midsternum.
What is the general purpose for using a lateral decubitus position? To demonstrate air or fluid levels in the thorax.
If a patient has fluid on right side of thorax, which lateral decubitus position should be used? Right lateral recumbent
Which side of the thorax will best demonstrate free air when the patient is in the left lateral decubitus position? Right
What positions are used to demonstrate air and fluid levels in a supine or prone position? Ventral and dorsal decubitus
For a dorsal decubitus position projection, what position is the patient placed in? Supine
For a ventral decubitus position projection, what position should the patient be placed in? Prone
Where is the CR entered on a patient for the dorsal decubitus projection? Midcoronal plane, approximately 3-4 inches distal to jugular notch
Where is the CR entered on a patient for the ventral decubitus projection? Midcoronal plane at level of T7
Which structure is not demonstrated within the mediastinum in PA projections of the chest? Diaphragm
Why should chest x-rays be performed with a 72-inch SID? To minimize magnification of the heart.
Why should chest x-rays be performed after the patient has suspended respiration after the second inspiration? To better expand the lungs.
With reference to the IR, how are the MSP and the MCP positioned for a chest PA projection? MSP: perpendicular; MCP: parallel
For a chest PA projection, what maneuver should be performed to remove scapulae from lung fields? Rotate the shoulders forward
For which chest projection should the MSP be parallel with the IR? Lateral projection
Regarding the IR, how are the MCP and MSP positioned for the lateral projection of the chest? MCP: perpendicular; MSP: parallel
Which chest projection demonstrates lung apices free from superimposition with the clavicles? AP axial projection, lordotic position (Lindblom method)
How many degrees should patient be rotated for PA oblique projections of the chest to evaluate the lungs? RAO: 45 degrees; LAO: 45 degrees
Using the lateral decubitus position for patients unable to stand best demonstrates which pathologic condition of the chest? Air or fluid levels
Regarding IR, how are the MSP and the MCP positioned for the AP chest (left lateral decubitus position)? Midsagittal: perpendicular; midcoronal; parallel
Which pathologic condition of the lungs is best demonstrated with the AP chest, right lateral decubitus position? Free air in the left side or fluid levels in the right side?
Which pathologic condition of the lungs is best demonstrated with the AP chest, right lateral decubitus position? Free air in the left side or fluid levels in the right side.
Which x-ray position requires that the patient be placed prone? Ventral decubitus
Which evaluation criterion pertains to the AP axial projections, lordotic position radiograph of the chest? The clavicles should lie superior to the apices.
Which decubitus would be performed for a patient with fluid on the left side? Left lateral decubitus
Which x-ray position requires the patient to be placed supine? Dorsal Decubitus
To demonstrate free air in the thoracic cavity on patient's left side, what position is used? Right Lateral decubitus
During an upright PA chest x-ray, why is the patient asked to flex their arms and rest the back of their hands on the hips? To rotate the scapulae laterally, avoiding superimposing the lungs.
Created by: rad1958tech on 2007-07-19



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