JPS6249281A - Emission ct apparatus - Google Patents

Abstract

PURPOSE:To obtain the image of a photographing target portion with a high resolution by enlarging and reconfiguring the image of the photographing target portion in an object to be examined by using part of the data of a radiation from the object that are collected by a detector. CONSTITUTION:The data of a radiation from a radioisotope given into an object to be examined are collected by a detector 2 revolving around the object and the image of a photographing target portion is enlarged and reconfigured by an image enlarging and reconfiguring unit 4 by using part of the whole collected data. Processing data specifying means 10 has a memory 12 storing the visual field range of the detector 2 necessary for collecting the data of the photographing target portion for every revolving angle of the detector 2. The means 10 specifies the data within the visual field range of the detector 2 necessary for collecting the data of the photographing target portion and within the visual field range changed for every revolving angle of the detector 2 by the revolving angle information of the detector 2 and the position information of the photographing target portion to the image enlarging and reconfiguring unit 4 as processing data.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to the use of radioactive isotopes (hereinafter referred to as 1q).
Throw! -'j() by rotating a detector around a subject to be examined, the emitted T-rays are collected, and a tomographic image of the distribution of R1 in the body is obtained.

[Technical Problems with the Invention] As shown in FIG. 3, the conventional emission CT apparatus uses, for example, an Anger-type gamma camera as a radiation detector 30, and uses this detector 30 as a radiation detector 30. The detector 30 is rotated stepwise or continuously around the object P.
This detector 30 detects and collects T-rays emitted in all directions with respect to the rotational surface of the object P, processes all the obtained detection data, and reconstructs a tomographic image of the RI distribution within the subject P. be.

In addition, in order to obtain high-resolution images of some organs, etc. in the obtained tomographic image, it is also possible to obtain enlarged images based on the data of the part of all the collected data. For this reason, the image is enlarged and reconstructed based only on data within a predetermined field of view of the detector 30.

By the way, the detector 301.12 is configured to rotate with the center of the subject P as the detector rotation axis [-L-1. Therefore, it is possible that there is no problem in enlarging the shadowiest target region located at the center of the subject P, or that it may be impossible to enlarge the shadowiest target region located at a position offset from the center of the subject P. there were.

That is, as shown in FIG. 4, the rhyming target part I;! is located at a position offset from the center O of the subject P. In collecting data on P1 (for example, the heart), first, if the field of view of the detector 30 is set to ``1'' at a position directly above the subject P, then when the detector 30 is rotated, for example, by 90° or 180°, This is because the field of view ranges F2 and F3 will be deviated from the imaging target region P1.

[Object of the Invention] The present invention has been made in view of the above circumstances, and is capable of reliably reconstructing an enlarged image of a tail-shaped target region located at a position offset from the center of rotation of a detector. The purpose is to encourage the placement of the ``Kill T Mitsea 1 In CT''.

1 Summary of the Invention] Summary of the present invention to achieve the above-mentioned object 1. 2. Detection that rotates around a subject and collects radiation data from a synthetic isotope administered into the subject. inside the subject using a part of the total data collected by the detector-C.
The above-mentioned image is enlarged (within the field of view of the detector necessary for data collection of the imaging part and the image U1 area) to the shadow target area (enlarge the area) ζ. Data within the field of view, which is varied for each rotation angle of the detector, is designated to the image enlargement and reconstruction unit based on the rotation angle information of the detector and the position information of the target part, together with the processing data. Processing data
[Embodiment of the Invention] The present invention will be described below with reference to an illustrated embodiment.

FIG. 1 is a block diagram of the Mittan C-King device according to the present invention. It rotates to detect and collect gamma rays emitted from the subject P. The pedestal 21-roller 3 performs data collection control in the pedestal 1, and in particular outputs a rotation angle information signal @ to control the rotation drive section (not shown) of the detector 2. ing. Further, this gantry controller 3 is configured to output rotation angle information of the detector 2 to a processing data specifying means (to be described later).

Reference numeral 4 denotes an image enlargement reconstruction unit, and a data collection interface (hereinafter abbreviated as data collection T/F) 5 which inputs all data collected by the detector 2 and outputs all or part of the data. , an acquisition memory 6 that stores the data output from the data acquisition 1/F 5, and a reconstruction unit 7 that reconstructs a tomographic image of the subject based on the data stored in the acquisition memory 6. Furthermore, the data collection I
/"5 receives a designation to process a part of all the collected data from processing data designation means 10, which will be described later. In this case, the processing The data I/F 5 outputs only the specified processing data.In addition, the data input 6 outputs only the specified processing data. Alternatively, image enlargement processing is performed by controlling reading from the memory.

Further, a display 8 is connected to the output end side of the image enlargement and reconstruction section 4 in order to display the image reconstructed by the image enlargement and reconstruction section 4.

Next, the processing data specifying means 10 will be explained.

This processing data specifying means 10 is within the field of view of the detector 2 necessary for collecting data of the object part of the object P, and includes rotation angle information of the detector 2 and 10 position information of the object part to be photographed. The data within the field of view, which is varied for each rotation angle of the detector 2, is designated as processing data to the data collection I/F 5 of the image enlargement and reconstruction unit 4. For this purpose, the processing data specifying means 10 is comprised of, for example, an enlarged position 11 and a storage section 12. The storage unit 12 stores a file in which information on the visual field range for each rotation angle m of the detector 2 is created in advance based on the (17) position information of the original target part. 3. Also, the enlarged position is 111JI;
, the rotation angle information of the detector 2 is inputted manually from the gantry go11 to []-ra3, and the corresponding visual field range information is read out from the recorder section 12, and the angle of rotation of the detector 2 is read out from the recorder section 12. 4) Specify the data to be subjected to enlargement processing.

The operation of the Emitshin C King Souvenir constructed as described above will be explained with reference to FIG. 2.

First, subject PI7)'1. In order to collect radiation data of a constant section, the detector 2 is rotated stepwise or continuously around the subject P based on the control of the frames 1 to 1-3. As a result, the collected data is sequentially output from the detector 2, and this data is manually input to the data collection 1/'5.

Here, as shown in FIG. 2, regarding the original target part [)1 (for example, the center l1M, etc.) which is shifted from the center O of the subject P (which almost coincides with the rotation center of the detector 2),
The Fj configuration of the enlarged image will be explained. In this case,
There are 6 concavities in which data relating to a region including at least the closed target region P1 is selected by data collection I/'5 and processed in each subsequent block.

For this reason, in the apparatus of this embodiment, the processing data specifying means 10 specifies the data to be selected M at the data collection I/F-5.

That is, as shown in FIG. 1゜
2. F3, etc. are stored for each rotation angle of the detector 2. In addition, each visual field range F1. F2, F3, . . . have different positions relative to the detector 2. This is because, while the detector 2 rotates around the center O, the imaging target region P1 is located at a position deviated from the center O.

Then, ε is applied to the processing γ-data designated f stage 10.
The rotation angle information of the detector 2 that collected the data is stored in the fields 2] and [1-F-1-RA 3] and the field of view corresponding to this angle information. Read the range from "Record section" 2. In addition, the enlarged position]n 1 roller 1
1, the read field of view range is the data collection I,...
' By specifying F 5, data collection ■/[data selection in 5] will be performed.

As a result, of all the data collected by the detector 2, only the data of the field of view that includes the shadowiest target region [)1 is outputted from the data collection I/F 5. The acquisition memory 6 performs data enlargement processing by controlling the writing or reading of the recorded data into the memory using a known method, and the reconstruction unit 7 reconstructs the tomographic image based on the enlarged data. The components will be different. So(〕
By displaying this on the display 8, an enlarged tomographic image of the imitation site P1 can be displayed, and diagnosis can be performed using an image with higher resolution.

It should be noted that the present invention is not limited to the above embodiments,
Various modifications are possible within the scope of the invention.

For example, the configuration of the processing f-data specifying unit 10 is not limited to that of the above embodiments, and at least the rotation angle information of the detector 2 and the 11' of the 18 shadows []! It is sufficient if the field of view range for each rotation angle can be specified from the position information.

The most preferable example is to configure and store a table of the visual field range in advance as in the above embodiment, but for example, the positional information of the target area to be imaged is manually input, and the visual field range is determined for each rotation angle of the detector 2. It may be calculated. In this way, reconstruction of an enlarged image of any part can be handled.

[Effects of the Invention] □ 1) As explained above, according to the present invention, it is possible to reliably reconstruct an enlarged image of a patterned part located off the center of rotation of the detector. Emissi can do it.”
It is possible to provide an in-line CT device.

Therefore, a high-resolution image of the rhyme target part)
This allows for more accurate diagnosis, etc.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the Mitsu 2120 device according to the present invention, and Fig. 2 shows the field of view of the target region to be imaged. FIG. 3 is a schematic explanatory diagram showing a frame of the emission C1-device, and FIG. 4 is a schematic explanatory diagram showing an example of setting the field of view range when enlarging an image, which is a conventional method. 2...Detector, 4...Image enlargement ■ component, 10...
Processing data designation means, P...Subject, Pl...Solid target site, 11 to "3
...Visual range. Agent Patent Attorney (111 Chika Ken Yudo Norio Ogo Figure 2 “3

Claims (2)

[Claims] (1) A detector that rotates around the subject and collects radiation data from a radioisotope administered into the subject;
an image enlargement reconstruction unit that enlarges and reconstructs an image of the target region within the subject using a part of all data collected by the detector; and a detector necessary for collecting data of the target region. Data within the visual field range that is varied for each rotational angle of the detector based on the rotational angle information of the detector and the position information of the imaging target region is sent to the image enlargement reconstruction unit as processing data. 1. An emission CT apparatus comprising processing data specifying means for specifying processing data. (2) The emission CT according to claim 1, wherein the processing data specifying means stores the visual field range of the detector necessary for collecting data of the imaging target region for each rotation angle of the detector. Device.