KR20120105185A - Multi-purpose pet-ct phantom - Google Patents

Abstract

PURPOSE: A multi-purpose PET(Positron Emission Tomography) CT(Computerized Tomography) phantom is provided to obtain an exact measured value by eliminating the need of a re-measurement process caused by change of a phantom installation position by simultaneously checking abnormality of a medical camera and image matching in a single phantom. CONSTITUTION: A material for PET video resolution measurement is filled within a first section body(100). A material for PET-CT image matching measurement is filled within a second section body(200). A material for CT image contrast measurement is filled within a third section body(300). An adapter(530) is placed on a lower portion of the third section body. A material for PET uniformity measurement is filled within a fourth section body(400).

Description

Multipurpose PET phantom {Multipurpose PET CT phantom}

The present invention relates to a phantom used in a medical imaging device.

With the rapid development of medical science devices, various imaging devices are being used to observe the inside of the human body in detail without incisions.For example, CT, MRI, and nuclear medical imaging devices. (SPECT), positron emission tomography (PET), and the like.

It is most desirable that such photographing devices output an accurate and clear image. To this end, a plurality of phantoms are used to check for abnormalities in the imaging inspection of the photographing apparatus and to perform a correction operation when there are abnormalities. Examples of the phantom include a phantom for PET image resolution measurement, a phantom for PET uniformity measurement, and a phantom for CT image contrast measurement.

Rather than measuring only one of resolution, uniformity and contrast in one imaging device and performing correction through it, it is most desirable to measure the resolution, uniformity and contrast if necessary and to perform the overall correction. .

Nevertheless, resolution, uniformity, and contrast measurement methods are different, and the phantom must be replaced for each measurement. For this purpose, the setup and preparation of the photographing apparatus must be performed separately. The problem arises that a remeasurement may be required depending on the subtle change in the installation position of the.

On the other hand, the plurality of imaging devices as described above have different advantages and disadvantages of the shooting principle, so that for accurate diagnosis and treatment is taken with a variety of imaging devices and to compare and analyze the image obtained through the recording.

Therefore, image registration for locating a fusion image obtained by using different imaging apparatuses at the same coordinates is essential. Image registration means obtaining a cross-sectional shape of a region of interest among image contents acquired by different photographing apparatuses and moving them to one reference coordinate through a marker to overlap them.

For accurate and convenient image matching, a phantom for measuring image matching is used, which enables multiple image acquisition and facilitates accurate error analysis of the matching result.

However, the present recognition that the phantom for measuring the image matching degree should also be used separately from the phantom for measuring the resolution, uniformity and contrast (in the case of CT). In other words, no attempt has been made to attempt to perform the imaging apparatus abnormality step and the image matching degree measurement step at one time with one phantom.

Accordingly, the present invention is to propose a phantom that enables the measurement of the resolution, uniformity and contrast for measuring and correcting the abnormality of medical imaging devices such as PET and CT by one phantom installation.

At the same time, we propose a phantom capable of measuring image matching.

In order to solve the above problems, the present invention includes a first section body, a second section body, a third section body and a fourth section body that can fill an isotope inside, and below the first section body. In turn, the second section body, the third section body and the fourth section body are located, the PET image resolution measuring material is filled in the first section body, and the PET-CT image registration degree in the second section body. The multi-purpose PET-CT phantom is characterized in that the measurement material is filled, the CT image contrast measurement material is filled in the third section body, and the PET uniformity measurement material is filled in the fourth section body. to provide.

In addition, it is preferable that a plurality of resolution measuring tubes having different diameters are located in the first section body.

In addition, it is preferable that a central tube and a plurality of members for measuring the degree of registration are located in the second section body. Here, the styrofoam is filled inside the center tube, and the matching degree measuring member is more preferably made of aluminum.

In addition, it is preferable that a plurality of contrast measuring members having different diameters are located in the third section body. Here, it is more preferable that the said control degree measuring member consists of Teflon.

More specifically, the multi-purpose PET-CT phantom, the cap is located on the upper side of the first section body capable of opening and closing; A separator positioned below the first section body and above the second section body; An adapter positioned below the third section body and above the fourth section body; And a bottom portion positioned below the fourth section body.

In addition, the length of the first section body is 75mm, the length of the first section body is 100mm, the length of the first section body is 25mm, and the length of the first section body is preferably 75mm.

According to the present invention, since the measurement for the resolution, uniformity and contrast measurement and the image registration for checking and correcting the medical imaging apparatus such as PET and CT are possible in one phantom, it is possible to set up as one setup and measurement. Not only can the procedure be completed, it is not necessary to re-measure due to phantom installation position changes, accurate measurements can be obtained, and the work is not cumbersome.

In addition, by adopting the minimum size for each measurement, the size of one phantom itself has the advantage that the operator is easy to handle.

1 is a perspective view of a multipurpose PET-CT phantom according to the present invention.
2 is a side view of the multipurpose PET-CT phantom according to the present invention.
3 shows a cross section of the first section body in accordance with AA in FIG. 2;
4 shows a cross section of the second section body as a cross section according to BB of FIG. 2;
5 shows a cross section of the third section body as a cross section according to CC of FIG. 2;
6 shows a cross section of the fourth section body as a cross section according to DD of FIG. 2;

With reference to the drawings will be described in detail the structure of the multi-purpose PET-CT phantom according to the present invention.

Multi-purpose PET-CT phantom according to the present invention has a structure for performing four functions, respectively, the first section body 100, the second section body 200, the third section body 300 and the fourth section It is referred to as body 400.

A cap 510 is located at the upper end of the multipurpose PET-CT phantom. The cap 510 is preferably fixed using a bolt on a cap mounting portion (not shown) of the main housing, and fills a plurality of section bodies 100, 200, 300, and 400 with a measuring material including an isotope. It is preferable that the opening and closing is possible.

A cap plug 515 is positioned at one side of the cap 510, and a sealing ring (not shown) is positioned between the cap 510 and the first section body 100 to form a tight seal.

A material for measuring PET image resolution may be filled in the first section body 100 to perform a PET spatial resolution function.

A plurality of resolution measuring tubes 110 are located in the first section body 100. In addition, in order to increase the accuracy of the resolution measurement and measure the resolution in various ways, the plurality of resolution measuring tubes 110 preferably have different diameters.

1 and 3, a total of twelve tubes 110 are shown, which shows an embodiment in which three different tubes are located, each having an outer diameter of 6 mm, 10 mm, 12 mm, and 15 mm.

The respective tubes 110 are positioned inside the first section body 100 in a shape suspended from the cap 510 so that they do not come into contact with the separator 520, and the inner diameters of the respective tubes are about 2.5 mm, 5 mm, 7.5 mm and 10 mm. As a resolution measuring material can be filled.

The inventors have confirmed through a number of experiments that the PET image resolution measurement in such a phantom is accurately performed in various ways.

PET image resolution measurement using the multi-purpose PET-CT phantom according to the present invention, a method of filling the isotope and taking an image inside the tube 110 (hot insert) and fill the isotope around the tube 110 to take an image This can be done through both cold inserts.

A separator 520 is positioned below the first section body 100 to be organically associated with the second section body 200.

The second section body 200 may be filled with a material for measuring PET-CT image registration, and may perform a PET-CT image registration function.

Inside the second section body 200, a central tube 210 and a plurality of matching members 220 are positioned. The tube performs a marker function for registration of PET images and CT images. To this end, the central tube 210 is made of acryl and is filled with a stripform on the inside, and the matching member 220 is preferably made of aluminum.

The PET-CT image registration degree measurement using the multi-purpose PET-CT phantom according to the present invention is performed by filling the isotope inside the second section body 200, acquiring the PET image and the CT image, and then evaluating the matching. do.

The lower side of the separator 520 is a hole (not shown) for receiving the upper surface of the center tube 210 and the matching member 220, the separator 520 is the first section body 100 And the connection of the second section body 200 as well as the position fixing of the tube 210 and the member 220.

The third section body 300 may be filled with a material for measuring CT image contrast to perform a CT image contrast function.

A plurality of contrast measuring members 310 are located in the third section body 300. In addition, in order to increase the accuracy of the contrast measurement and measure the contrast by various methods, it is preferable that the plurality of contrast measurement members 310 have different diameters.

1 and 5, a total of four members 310 are shown, the outer diameter being 5 mm, 10 mm, 15 mm and 20 mm. Each member 310 is preferably made of Teflon.

Outside the upper surface of the third section body 300, a hole (not shown) for accommodating the central tube 210 inside the second section body 200 and the lower surface of the matching member 220 is located. The upper surface of the third section body 300 serves as the lower surface of the second section body 200 and may connect the two bodies without a separate separator or an adapter.

An adapter 530 is positioned below the third section body 300, and the adapter 530 serves as a lower surface of the third section body 300 and an upper surface of the fourth section body 400.

A material for measuring PET uniformity may be filled in the fourth section body 400 to perform a PET uniformity function.

A bottom portion 540 is positioned below the fourth section body 400, and a bottom plug 545 is positioned at the center of the bottom portion 540.

PET uniformity measurement is performed by filling up the radioisotope in the fourth section body 400 and acquiring a PET image.

First section body 100, second section body 200, third section, considering the minimum depth for performing unique functions in each section body 100, 200, 300, 400 The length of the body 300 and the fourth section body 400 could be made about 75 mm, 100 mm, 25 mm and 75 mm, respectively (see FIG. 2).

In this case, except for the cap 510, the separator 520, the adapter 530 and the bottom 540, the overall size of the phantom can be up to 275mm, the difference between the size and the conventional phantom It is possible to perform all four phantom functions for PET-CT measurement without any, so that PET-CT related measurements can be performed at the same time without the need for replacement of phantoms, and at the same time, accurate measurement can be performed.

Although the preferred embodiments of the present invention have been described, the present invention is not limited to the specific embodiments described above. That is, those skilled in the art to which the present invention pertains can make many changes and modifications to the present invention without departing from the spirit and scope of the appended claims, and all such appropriate changes and modifications are possible. Equivalents should be considered to be within the scope of the present invention.

100: first section body
110: tube for resolution measurement
200: second section body
210: central tube
220: member for measuring the degree of conformity
300: third section body
310: member for measuring the contrast
400: fourth section body
510: cap
515: cap plug
520: separator
530: adapter
540: bottom
545 bottom plug

Claims (8)

A first section body, a second section body, a third section body and a fourth section body capable of filling an isotope inside,
The second section body, the third section body and the fourth section body are sequentially positioned below the first section body,
The first section body is filled with a material for measuring PET (positron emission tomography) image resolution,
The second section body is filled with a material for measuring PET-CT image registration degree,
A CT image contrast measurement material is filled in the third section body, and
Characterized in that the PET uniformity measurement material is filled in the fourth section body,
Versatile PET-CT Phantom.
The method of claim 1,
Characterized in that the plurality of resolution measuring tubes of different diameters are located in the first section body,
Versatile PET-CT Phantom.
The method of claim 1,
Characterized in that the central tube and a plurality of members for measuring the degree of registration is located in the second section body,
Versatile PET-CT Phantom.
The method of claim 3, wherein
Styrofoam is filled inside the central tube, and
The matching degree measuring member is made of aluminum,
Versatile PET-CT Phantom.
The method of claim 1,
Characterized in that the plurality of contrast measuring members of different diameters are located in the third section body,
Versatile PET-CT Phantom.
The method of claim 5, wherein
Said contrast measuring member is made of Teflon,
Versatile PET-CT Phantom.
7. The method according to any one of claims 1 to 6,
The multi-purpose PET-CT phantom,
A cap positioned on an upper side of the first section body and capable of opening and closing;
A separator positioned below the first section body and above the second section body;
An adapter positioned below the third section body and above the fourth section body; And
Further comprising a bottom portion located below the fourth section body,
Versatile PET-CT Phantom.
The method of claim 7, wherein
The length of the first section body is 75 mm,
The length of the first section body is 100mm,
The length of the first section body is 25 mm, and
The length of the first section body is characterized in that 75mm,
Versatile PET-CT Phantom.

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