Question

Which of the following factors must be applied to minimize distortion of the heart when performing an AP projection of the chest?

1) use a 72 inch(183 cm) SID
2) use a high mA and short exposure time
3) perform the study erect
4) use a high kV technique

Answer 1

To minimize distortion during an AP chest projection, it's crucial to use a 72 inch SID, high mA with short exposure time, perform the procedure erect, and use a high kV technique for optimal clarity and reduced distortion.

Step-by-step explanation:

To minimize distortion of the heart when performing an AP projection of the chest, the following factors should be applied:

1. Use a 72 inch(183 cm) SID (Source-to-Image Distance) to reduce magnification of the heart.
2. Use a high mA (milliamperes) and short exposure time to minimize motion blur and ensure image clarity.
3. Perform the study erect, which allows the diaphragm to move downward and the heart to hang in a more natural position, reducing the distortion.
4. Use a high kV (kilovoltage) technique to penetrate the mediastinum adequately and ensure that the ribs and spine do not obscure the heart structures.

These techniques together help to produce a clearer image with less distortion of the heart structures.