Flow imaging cytometer

• US 5,159,398 A
• Filed: 09/05/1991
• Issued: 10/27/1992
• Est. Priority Date: 02/27/1991
• Status: Expired due to Term

• Current Assignee: Toa Medical Electronics Co., Ltd.
• Original Assignee: Toa Medical Electronics Co., Ltd.
• Inventors: Maekawa, Yasunori, Kosaka, Tokihiro
• Primary Examiner(s): McGraw, Vincent P.
• Application Number:
  US07/755,549
• Time in Patent Office: 418 Days
• Field of Search: 356/39, 356/72, 356/73, 356/318, 356/417, 356/23, 250/461.2, 382/6
• US Class Current: 356/73
• CPC Class Codes: G01N 15/1427 with the synchronisation of components, a time gate for operation of components, or suppression of particle coincidences
• CPC Class Codes: G01N 15/1429 Signal processing
• CPC Class Codes: G01N 15/1459 the analysis being performed on a sample stream
• CPC Class Codes: G01N 2015/144 Imaging characterised by its optical setup
• CPC Class Codes: G01N 2021/1791 stroboscopic; pulse gated; time range gated
• CPC Class Codes: G01N 21/6456 Spatial resolved fluorescence measurements; Imaging

Abstract

A white-light image and a fluorescent image are capable of being captured by a single video camera, and a single light source for producing exciting light is used to pick up the fluorescent image and monitor arrival of particles to the image capturing area. Specifically, besides a strobe light source, a light source, the output of which normally is low, is provided for exciting fluorescence and for monitoring cell flow-through. An image intensifier is used in the light-receiving system of the fluorescent image and is supplied with a voltage the size and timing of which are controlled in such a manner that the irradiation of a cell with the strobe light when the white-light image is captured will not have an adverse effect upon the aforementioned light-receiving system. This makes it possible to pick up two images each in a different zone on the light-receiving surface of image capturing means.

Claims

1. A flow imaging cytometer comprising:

a flow cell formed to include a flat flow path for causing a specimen solution containing particle components to be sensed to flow as a flat stream;

a first light source arranged on a first side of said flow cell for irradiating the specimen solution in said flow cell with light the quantity of which is switched;

a second light source arranged on a first side of said flow cell for irradiating the specimen solution in said flow cell with pulsed light;

first image capturing means arranged on a second side of said flow cell for capturing still pictures of particle components in the specimen solution irradiated with high-luminance pulsed light from said first light source and particle components irradiated with the light from said second light source;

second image capturing means arranged on the second side of said flow cell for capturing still pictures of particle components in the specimen solution irradiated continuously with low-luminance light from said first light source;

processing means for executing prescribed analysis based upon image data from said first and second image capturing means; and

control means for detecting the particle components based upon the image data from said second image capturing means, and on the basis of such detection, first for switching said first light source over to irradiation with the high-luminance light, and then operating said second light source following a prescribed delay, within an image capturing period of said first image capturing means;

wherein said first light source is a light source for exciting fluorescence, and the image resulting from said first light source and the image resulting from said second light source are each captured in a different area on a light-receiving surface of said first image capturing means.

2. The flow imaging cytometer according to claim 1, wherein said first image capturing means has a two-dimensional image capturing area on the flow of the specimen solution, said second image capturing means has a linear image capturing area on the flow of the specimen solution, the image capturing area of said second image capturing means is formed so as to cross the flow of the specimen solution within the image capturing area of said first image capturing means, the image capturing area of said first image capturing means is divided into a zone which includes, and a zone which does not include, the image capturing area of the second image capturing means, and an image in one of these zones resulting from irradiation with the high-luminance light from said first light source and an image in the other of these zones resulting from irradiation by said second light source are captured by said first image capturing means.

3. The flow imaging cytometer according to claim 2, further comprising masking means for interrupting light on the optic path of said first image capturing means in such a manner that the two images do not overlap each other on the light-receiving surface of said first image capturing means.

4. The flow imaging cytometer according to claim 2, further comprising means for forming the irradiating light from said first light source into an elongated elliptical shape.

5. The flow imaging cytometer according to any one of claims 1 through 4, wherein a light-receiving system of a fluorescent image is provided with an image intensifier, and said image intensifier is operated only when the fluorescent image is captured.