Cardiac CT Angiography

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Questions and Answers

Why is it important to have the patient in a supine position with both arms above their head during a pulmonary CT angiography?

To reduce respiratory motion artifacts.
To improve ECG signal quality.
To minimize beam hardening artifacts from the shoulders. (correct)
To ensure proper contrast agent distribution.

What is the primary reason for using ECG gating in pulmonary CT angiography?

To synchronize image acquisition with the cardiac cycle, reducing motion artifacts from the beating heart. (correct)
To improve contrast enhancement in the pulmonary arteries.
To allow for faster scanning speeds.
To reduce the overall radiation dose to the patient.

In a prospective ECG-gated pulmonary CT angiography, when does the CT scanner acquire data?

Only after the entire contrast bolus has been administered.
Randomly, triggered by respiratory signals.
Continuously throughout the cardiac cycle.
Only during a pre-selected portion of the cardiac cycle. (correct)

What is the purpose of performing a test bolus prior to the diagnostic pulmonary CT angiography scan?

To determine the optimal scan delay for contrast enhancement. (D) Signup and view all the answers

Why is a high iodine concentration contrast agent (e.g., 350 mg iodine/mL) typically used in pulmonary CT angiography?

To maximize the attenuation difference between the pulmonary vessels and surrounding tissues. (B) Signup and view all the answers

What is the rationale behind using automated tube current modulation (TCM) during a pulmonary CT angiography?

To maintain a constant image quality while minimizing radiation dose. (A) Signup and view all the answers

During a pulmonary CT angiography, what anatomical coverage is typically included in the scout scan?

Pulmonary apices to below the heart. (D) Signup and view all the answers

If a craniocaudal scan direction is selected for a pulmonary CT angiography, in which direction does the CT scanner acquire the images?

From the head towards the feet. (C) Signup and view all the answers

What is the appropriate flow rate for contrast injection during pulmonary CT angiography, according to the provided guidelines?

5-6 ml/s. (C) Signup and view all the answers

How does retrospective ECG gating differ from prospective ECG gating in pulmonary CT angiography?

Retrospective gating acquires data continuously throughout the cardiac cycle, while prospective gating acquires data only during a specific phase. (D) Signup and view all the answers

Flashcards

Patient position for cardiac CT

Lying on the back with arms raised above the head.

ECG Gating in Cardiac CT

A technique using the ECG signal to trigger or synchronize CT data acquisition.