JPH02198338A - Method for measuring human body - Google Patents

Abstract

PURPOSE:To measure a human body for a long time by projecting YAG laser on the human body, and detecting the YAG laser which is transmitted through said organism. CONSTITUTION:A YAG laser oscillator 6 undergoes laser control 8. The YAG laser which is outputted from the oscillator 6 passes through a laser transfer system 5 and a laser-light projecting part 3. The laser is projected on a human body on an image sensing region 2. The laser 15 which is transmitted through the human body is detected with a YAG laser detector 4. The projection data at this time are collected into a computer 9. This operation is performed at the entire angles around the human body. The two-dimensional tomogram image is obtained by reconstituting these one-dimensional data. A bed 13 on which a patient lies down so that the patient is sent into a region 2 in a gantry 1 is controlled with a bed driving part 14 and a computer 9. The laser transfer system 5 is controlled 7 with the computer 9. A laser-control part 8 also receives a control signal from the computer 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is directed to a bioneedle Al11 method for use in the medical field or in the industrial field requiring a non-invasive, non-destructive needle Δp1 made of a material that has the property of transmitting YAG laser. It is related to.

[Conventional technology]

"X-ray CT" will be explained as a technology for displaying tomographic images of the human body.

"X-ray CTJ irradiates hundreds of thousands of parallel and rotated X-ray microbeams onto the tomographic plane of the human body, receives the beams with an X-ray detector, and uses the output data to reconstruct an image using a computer. This is a technology to obtain tomographic images.

FIG. 3 is a block diagram showing an example of an "X-ray CTJ", and this "X-ray CTJ" consists of an X-ray tube a and an X-ray detector C that receives , X-ray tubes a and xll
a gantry e having an imaging area d provided between the detector colors;
1 Bed f for placing a patient and transporting him into the gantry e
1 Bed drive unit g A computer that receives signals from the X-ray detector C and performs processing to reconstruct tomographic images hSX-ray generator 11 X-ray controller j, disk 1401 that displays one image on a disk 1401 Takes a hard copy of the image It consists of a recording section m of a Polaroid camera, a multi-format camera, etc.

X-rays emitted from the X-ray tube a pass through the subject (human body), and the amount of XtIA that passes through is detected by the X-ray detector C to collect projection data. This operation is performed from all angles. A two-dimensional tomographic image is obtained by reconstructing these one-dimensional data.

An example of the projection data acquisition method is the Rotate/Rotate method. As shown in Figure 4, X-ray tube a emits fin-shaped X-rays that spread out to about 30 to 40'', and subject n is included in the fan-shaped fin-shaped X-rays. The projection data is collected by rotating together with the tube a and the X-ray detector C. Note that o and p in the figure indicate the rotation loci of the X-ray tube a and the X-ray detector C. The device C is composed of 256 to 500 or more elements, and the detection elements include a high-pressure Zenon gas detector, a scintillator, and a Photo-dio.
Semiconductor detectors combined with de are mainly used.

[Problem that the invention seeks to solve]

The above-mentioned conventional biological measurement methods such as X-ray CTJ required a large amount of X-ray irradiation.For example, in the case of gastric examination, the amount of X-ray irradiation for X-ray photography was 0.1 rem per time. On the other hand, in the case of rX-ray-CTJ, the amount of X-ray irradiation is about 1 re- or more per time, which is more than 10 times that of X-ray photography.

For this reason, it has been impossible to use X-ray CTJ for a long time because it causes X-ray damage to living organisms such as the human body.

Also, attempts are being made to realize "optical CTJ" using light, but the wavelengths used are 500 to 80.
It is around 0 mm, and sufficient permeability to the living body to enable CT is not obtained in this band.

The present invention has been developed in consideration of the above, and there is no need to worry about biological damage such as X-ray damage when using X-rays on a living body, and therefore,
It is an object of the present invention to provide a living body measuring method that allows measuring n1 of a living body by CT method over a long period of time.

[Means to solve the problem]

In order to achieve the above object, the biological measurement method according to the present invention irradiates a living body with a YAG laser, detects this YAG laser that has passed through the living body with a detector, and uses the output data to generate an image on a computer. A tomographic image of the above-mentioned living body was obtained by reconstruction.

[For production]

When a YAG laser with a wavelength of about 1064 rv was used, sufficient transmission intensity was obtained for the dynamic range of the streak camera. Since this YAG laser is weak, it does not cause damage to living organisms.

〔Example〕

An embodiment of the present invention will be described based on FIG.

A YAG laser irradiation unit 3 is provided to face the imaging area 2 in the gantry 1, and a YAG laser detector 4 is provided at a position facing the YAG laser irradiation unit 3 across the imaging area 2.
will be established. The YAG laser irradiation section 3 is connected to a YAG laser transmission system 5, and this YAG laser transmission system 5 is connected to a YAG laser oscillator 6 and a YAG laser transmission controller 7. 8 is a YAG laser controller, and 9 is a computer that controls the recontrollers 7 and 9 and receives signals from the YAG laser exhibitor and others. Also 1o
is a disk, 11 is a display, 12 is a recording unit of a Polaroid or multi-format camera, etc., 13 is a bed, 1
4 is a bed driving section.

In the above configuration, the YAG laser oscillator 6 is controlled by the YAG laser controller 8, and the YAG laser output from the YAG laser oscillator 6 is transmitted to the YAG laser transmission system 5,
The light passes through the laser irradiation unit 3 and is irradiated onto the human body above the imaging area 2 . The YAG laser 15 that has passed through the human body is detected by the YAG laser detector 4, and projection data at this time is collected by the computer 9. This operation is performed from all angles around the human body. A two-dimensional tomographic image is obtained by reconstructing these one-dimensional data.

A bed 13 on which a patient is placed and transported to an imaging area 2 within a gantry 1 is controlled by a bed driving section 14 from a computer 9.

The YAG laser transmission system 5 is controlled by a YAG laser transmission system controller 7 from a computer 9. . The YAG laser controller 8 also receives control signals from the computer 9.

The data of the two-dimensional tomographic image is stored on the disk 10 and displayed on the display 11. A hard copy of this image is then obtained from the recording unit 12.

When a short pulse on the order of tens of picoseconds to femtoseconds is used in the YAG laser, a two-dimensional image with higher resolution can be obtained than when a CW laser is used.

Figures 2 (A) and (I3) show the intensity of the transmitted light when a living body is irradiated with light and the transmitted light is detected by a streak camera. Figure 2 (A) shows the intensity of the transmitted light when the wavelength is 500 to 800 nm. When using nearby light, the wavelength in Figure 2 (B) is 11064.
This is a case where a YAG laser of n is used.

As is clear from this figure, when the YAG laser was used, sufficient transmission intensity was obtained for the dynamic range of the streak camera.

〔Effect of the invention〕

According to the present invention, a tomographic image of the living body is obtained by irradiating the living body with a YAG laser and detecting the YAG laser that passes through the living body. There is no need to worry about biological damage such as X-ray interference, and living bodies can be measured over long periods of time using the CT method.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing an embodiment of the present invention, Figure 2 (^
) and (B) are diagrams showing the transmitted light intensity when a living body is irradiated with light, where (A) shows the case of light and (B) shows the case of YAG laser. FIG. 3 is a block diagram showing a conventional example, and FIG. 4 is an explanatory diagram of the Rotate/Rotate method of X-ray CT. 1 is a gantry, 2 is an imaging area, 3 is a YAG laser irradiation unit, 4 is a YAG laser detector, 9 is a computer, and 10 is a disk. Figure 1

Claims (2)

[Claims] (1) A living body is irradiated with a YAG laser, this YAG laser that passes through the living body is detected by a detector, and the output data is used to reconstruct the image on a computer to obtain a tomographic image of the living body. A biological measurement method characterized by: (2) The biological measurement method according to claim 1, characterized in that a YAG laser with short pulses on the order of several picoseconds to femtoseconds is used.