focallength中文

In optics, the distance from the middle of the lens to its focal point. Light rays run in parallel to one another, while lenses distort light rays: a convex lens (the type that is thicker in the centre than at the edges) brings them closer together and a concave lens (the type that is thinner in the centre) forces them apart. Cameras use convex lenses to bring the light rays together to a point where they converge and the image is in focus: this is where the film or light sensitive diode goes. The more convex (or thicker) the lens, the more severely the light rays are bent and the shorter the focal length (conversely, the thinner the lens the longer the focal length). Different focal lengths create different kinds of image effects. Lenses with very short focal lengths (or wide angle lenses) allow more of the picture to be seen and emphasize foreground elements, whereas lenses with very long focal lengths (or telephoto lenses) allow less of the picture to be seen and emphasize background elements which appear to be magnified. These different effects are dramatically illustrated by a technique used in feature films called a Hitchcock zoom, where the camera tracks out at the same time as it zooms in (or vice versa), an effect used in the film Vertigo (1958).

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focallength是什么

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Focus is the sharpness or clarity of an image. It's the element that directs the viewer's eye to the subject of the photograph, creating a strong connection ...

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Normally, CVP is roughly half of the PCWP. (37633442) Alterations in this ratio may help diagnose RV-predominant or LV-predominant shock.

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Focal length

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Over-wedging occurs if the RHC is too distal in the pulmonary artery.  This is dangerous because it increases the risk of pulmonary artery rupture.

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FOV tofocal length

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VO2 is the amount of oxygen utilized by the tissues, calculated below. A normal VO2 at rest is typically 3.5 ml/kg/min or 125 ml/min/m2 body surface area (often roughly 250 ml/min):

Optical filters improve the performance and accuracy of optical systems by selectively transmitting, reflecting or blocking specific wavelengths or ranges of ...

DO2 is the amount of oxygen delivered to the tissues, calculated below. A normal DO2 is 330-500 ml/min/m2 (often roughly 1,000 ml/min):

Hemodynamic assessment can generally be made non-invasively. High-quality echocardiographic images with Doppler can provide substantial hemodynamic information (e.g., cardiac output based on the velocity-time integral), making the utility of the RHC debatable. (28595621)