| ventriculography, first-pass | Radionuclide ventriculography where a bolus of radionuclide is injected and data are recorded from one pass through the heart ventricle. Left and right ventricular function can be analyzed independently during this technique. First-pass ventriculography is preferred over gated blood pool imaging for assessing right ventricular function. (12 Dec 1998) |
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| pass | 1. An opening, road, or track, available for passing; especially, one through or over some dangerous or otherwise impracticable barrier; a passageway; a defile; a ford; as, a mountain pass. ""Try not the pass!" the old man said." (Longfellow) 2. A thrust or push; an attempt to stab or strike an adversary. 3. A movement of the hand over or along anything; the manipulation of a mesmerist. 4. A single passage of a bar, rail, sheet, etc, between the rolls. 5. State of things; condition; predicament. "Have his daughters brought him to this pass." (Shak) "Matters have been brought to this pass." (South) 6. Permission or license to pass, or to go and come; a psssport; a ticket permitting free transit or admission; as, a railroad or theater pass; a military pass. "A ship sailing under the flag and pass of an enemy." (Kent) 7. A thrust; a sally of wit. 8. Estimation; character. "Common speech gives him a worthy pass." (Shak) 9. [Cf. Passus] A part; a division. Pass boat, a wooden or metallic box, used to carry cartridges from the service magazine to the piece. Pass check, a ticket of admission to a place of entertainment, or of readmission for one who goes away in expectation of returning. Origin: Cf. F. Pas (for sense 1), and passe, fr. Passer to pass. See Pass. Source: Websters Dictionary (01 Mar 1998) |
| high-pass filter | A device or material that allows high frequency signals to pass while attenuating other signals. (05 Mar 2000) |
| low-pass filter | A device or material with the opposite effect from a high-pass filter; most tissues act as low-pass filters of ultrasound signals. (05 Mar 2000) |