| 摘要 |
A method of reducing an amount of contrast material delivered to a patient during an imaging procedure. The method comprising: (a) injecting contrast material through a catheter with a first cross-section; and (b) increasing said cross-section of said lumen to a second cross-section greater than said first cross-section along a portion of the lumen comprising 10% to 90% of a length of said lumen; wherein said increasing occurs after said injection.
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