The effect of time delay for magnetic resonance contrast-enhanced scan on imaging for small-volume brain metastases.

However, the maximum diameter of metastases from 18 to 20 min in 45.7 % of patients showed an increasing trend; 37.5 %, showed a downward trend; and 16.8 %, showed no change.

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Simultaneously, we analysed the signal intensity of the tumours and white matter and found that tumour signal intensity and ratio of tumour to white matter signal intensity showed a decreasing trend with each time delay.

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