MPI: Procedure And Interpretation

Question 1

Motion artifact greater than how many pixels require repeat imaging?

Answer 1

2 pixels or greater

Question 2

Upward creeping

Answer 2

Occurs when imaging is performed soon after strenuous exercise and results from the repositioning of the cardiac structures as the respiratory excursion decreases following exercise

May be avoided if imaging is delayed for about 15 min after exercise

Question 3

Extracardiac artifacts

Answer 3

Contamination on skin and clothing
Neoplastic lesions
Subdiaphragmatic activity (liver, Gi)

Question 4

Attenuation artifacts

Answer 4

Diaphragm - men inferior wall

Breast - women anterior wall

Question 5

Sum stressed score

Answer 5

Small defect : 5-10% of LV, 1-2 segments

Moderate defect: 15-20%, 3-4 segments

Large defect: >20%, >=5 segments