DE2028073A1 - Coloured photographic recording - for electronically stored - intensity distribution patterns - Google Patents

Abstract

Information derived from any system or use in which the data are stored for subsequent display in fluorescent form of isointensity zones, and esp. in nuclear medicine using gamma cameras or the like, is so reproduced and photographed using the appropriate selective filters, using any film desired including Polaroid (RTM). To increase discrimination and accuracy, with a relatively simple equipment, electronics (e.g. potential dividers) are used for automatic filter change and for fixing the band width of isointensity for each exposure to suit statistical conditions.

Description

@etr .: Veriahren for colored photographic representation electronically stored intensity distribution pattern.

D e ctio n g e A simple photographic process is used describe, which offers the possibility of stored intensity distribution patterns - to be registered in multiple colors as shown on an oscilloscope screen.

The procedure, initially developed for nuclear medicine diagnostics, @ie enables multi-color registration of isoactivity zones in camera scintigrams. This method can in principle be used with any gamma camera storage unit.

The following excerpt from my The lecture I gave on May 24th, 1970 at the "German X-ray Congress" in Munich have held: The basic equipment of the tested system (Nuclear Chicago, @ eusenstamm / Ffm.) consists of a measuring head with scintillation crystal, the control panel and a multi-channel analyzer as memory. The scintigram registered by the camera is saved in the analyzer according to an image grid area of 64x64 points. On the screen of the analyzer, every I memory space that contains information contains, shown as a bright image point.

By means of a differential discriminator, zones of equal activity are created au @ the oscilloscope screen is brightly controlled, with the Width of Zone corresponds to the set channel width and the position of the zone by changing the discriminator threshold can be varied. The actual color registration process takes place on the oscilloscope screen of the analyzer.

The attached schematic drawing is intended to illustrate the registration process describe, which corresponds to a colored representation of a thyroid scintigraphy.

On the oscilloscope screen of the analyzer (left in the picture) zones of different information content using the potentiometer shown shown, e.g. the zone of lowest activity. These pixels are with a normal 35mm camera on a color positive screen with a color filter attached, here e.g. blue, registered. @On the film we get partial image 1 (below in the middle).

If now the other isointensity zones, each area is higher Activity can then be registered using other color filters are obtained one after the other (i the figures 2, 3, 4, which can be seen at the bottom right. The picture 4 corresponds to the zone of highest activity.

However, since the coloring gives the human eye a means of differentiation offers, we can also capture the 4 color zones from the beginning on a single picture. That means we only have to change the areas set on the analyzer with different Register color filters, but without transporting the film by multiple exposures. We see the result in the lower left corner of the schematic drawing.

Since the information on the analyzer is purely digital, is fundamental the number of color filters used is unlimited. However, one should make a choice the zone width also take into account that, due to the statistics, certain Limits must be respected. The standard deviation or a fourfold of this is recommended as a measure of the relation between the position of the zone and the zone width.

In order to facilitate the production of color photographs, one uses preferably a filter wreath. When the filter is changed, the trigger also becomes Made. The color system from AGA, Hamburg, was used for thermovision recordings used device with a filter ring attached in front of a 35mm camera 8 color filters and double shutter release.

The multicolor registration of isointensity zones in camera scintigrams enables, in contrast to black-and-white memory depletion, a much better selir and, above all, the possibility of quantitative differentiation. This benefit can go through Comparison of color and black-and-white memory images are documented. Farther this purely digital process offers the prerequisites for a small-regional one Localization of functional states with simultaneous more precise quantitative analysis in any number of phases of a function sequence.

The method was also used for creating colored Polaroid images modified.

For further explanation of the procedure, the attached as an annex Publication in May 1970 in the Piach magazine: "Port steps on the Areas of X-rays and Nuclear Medicine "(Georg Thieme Verlag, Stuttgart) has appeared.

The application of the method was here for a special device unit (a. Nuclear Chicago, Heusenstamm / Ffm.) and for a specific area of application (Nuclear medicine). However, the procedure can also be applied to any other Devices and other uses when using of any storage system, the representation of different zones is the same Information content on an oscilloscope screen is possible (examples: electron microscopy, Nuclear physics etc.)

Claims (1)

Re: Procedure for the color representation of electronically stored Intensity distribution pattern. P a t e n t a n s p r ü c h e 1. Process of color photographic Representation of isointensity zones using storage systems (for any Color films including Polaroid film). For all devices and areas of application where storing Systems are used which offer the possibility of isointensity zones on a luminous screen and enable the use of the color registration process 2. Process using the color photographic representation of isointensity zones Storage systems (for any color films including Dolaroid pilm. For the special application area of nuclear medicine when using from gamma cameras or similar systems. 3. The idea of using electronic (voltage divider circuit or similar) and mechanical aids that make it possible with each partial exposure changing the filter and selecting the zone width (variable zone width, adapted to statistical conditions) to be coupled to the accuracy of the recording process increase and simplify the registration process.