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Hand exercise during contrast medium delivery at thoracic helical CT: a simple method to minimize perivenous artifact
M Nakayama1, Y Yamashita, Y Oyama
1Department of Radiology, Kumamoto University School of Medicine, Japan.
Purpose:
The purpose of this work was to assess the effects of hand exercise on perivenous artifact caused by undiluted venous contrast material at thoracic helical CT.
Method:
Eighty patients were prospectively and randomly assigned to thoracic helical CT with (n = 42) or without (n = 38) intermittent squeezing of a hand-sized ball during delivery of a contrast material. Two radiologists graded perivenous artifact and arterial enhancement in a blind fashion. CT attenuation values were obtained by region-of-interest measurements from arteries and veins.
Results:
Both qualitative and quantitative analyses showed statistically significant differences in the assessment of perivenous artifact (p < 0.01). Perivenous artifact from the subclavian vein was significantly reduced in patients subjected to thoracic helical CT by using a hand exercise method.
Conclusion:
Hand exercise during contrast material delivery at thoracic helical CT minimizes perivenous artifact and improves image quality.