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Click here to see our objects about Image Intensification
At the end of the 1930's the development of the receiver tubes were unpredictable. In 1937 Langmuir patented the use of an image intensifier to scan an x-ray image on a fluorescent screen. In the fifties many factories offered a combined fluorescent screen on an image intensifier. This image intensifier tube produced a reduced optical image on the screen viewed through a lens or a microscope bright enough in daylight for the doctor to discern small details The fifties were also the years of a dropped x-rays dose levels by a factor 100 due to the image intensity increasing. The advantage of this new instrument is its application in the surgical practice, thanks to the considerable increase in brightness of the fluorescent screen image. (O-21)
The vidicon Camera tube in which a charge-density pattern is formed by the imaged scene on a photoconductive surface, which is then scanned by a beam of low-velocity electron. The fluctuating voltage coupled out to a video amplifier can be used to reproduce the scene being imaged (O-315).
The target material in a vidicon camera tube. The material is antimony sulphide, Sb2S3. The advantage of a vidicon tube with this target material is the low noise level of the image, due to its high inertia. Due to this property, the vidicon tends to integrate and therefore average the quantum noise, giving an image with a low noise level. On the other hand, rapid movement of the object is not imaged clearly with a vidicon. Other drawbacks are the low gamma (0.7) and the high dark current (10 – 30 times higher than for plumbicon or saticon tubes).
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Saticon
A type of television camera in which the target material is made of amorphous selenium. This material is suitable for use in digital fluoroscopy DF units due to its linearity and low dark current.
Plumbicon
A (Television, camera) containing lead (Latin : plumbum) monoxide as input screen material (target)
Orthicon
A camera tube in which a low – velocity electron beam scans a photoactive mosaic that has electrical storage capacity. The image to be transmitted is thus projected on the mosaic. (O-283) (O-374).
Iconoscope
A camera tube that employs a high – velocity electron beam to scan a photoemissive mosaic and to store electrical charge patterns.