CN112741642A

CN112741642A - Temperature balancing device of CT detector

Info

Publication number: CN112741642A
Application number: CN202011606875.8A
Authority: CN
Inventors: 孙锋; 方泽莉; 朱炯; 黄振强
Original assignee: FMI Technologies Inc
Current assignee: FMI Technologies Inc
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-05-04
Anticipated expiration: 2040-12-28
Also published as: CN112741642B

Abstract

The invention belongs to the technical field of CT, and particularly relates to a temperature balancing device of a CT detector. The system comprises a plurality of detectors, a CT frame and a plurality of fans; each detector is fixedly arranged on the CT frame; the edges of the two ends of each detector are respectively provided with a first heating strip and a second heating strip; the CT machine frame is provided with a plurality of mounting castings, and the side walls of the detector are tightly attached with the mounting castings; the first heating strips and the second heating strips are non-uniformly distributed heating strips; the fans are all placed beside the side wall of the detector and are respectively arranged on two sides of the detector together with the mounting castings. According to the invention, the heating device with non-uniform distribution is designed according to the distribution of the heat dissipation power of each CT detector module, so that the temperature of each module can be kept consistent when the detector works, the image quality is further improved, and the CT detector module heating device has the characteristics of simplicity and high efficiency.

Description

Temperature balancing device of CT detector

Technical Field

The invention belongs to the technical field of CT, and particularly relates to a temperature balancing device of a CT detector.

Background

The application of CT in clinical diagnosis is becoming more and more widespread, and good CT image quality is an important basis for diagnosis by doctors. Obtaining good image quality requires a coordinated cooperation of aspects, wherein the performance of the CT detector is a decisive factor for the quality of the CT image. To obtain good image quality, the CT detector needs to operate under as ideal conditions as possible, with as low a temperature as possible, and as well as balanced a temperature as possible, so that the performance of all detector modules remains consistent, since the theoretical model of CT reconstruction is that the performance of each module of CT is considered to be the same. The ambient temperature of the CT is determined by the overall system, but the temperature equalization of the CT detector modules can be achieved by individually controlling the detector modules.

In practice, however, the detector needs to be mounted on the CT gantry, and a fan needs to be installed to assist in temperature regulation, resulting in a very uneven temperature distribution.

Therefore, it is necessary to design a temperature equalization device for CT detector.

For example, chinese utility model patent application No. CN201320410027.9 discloses an on-vehicle shelter CT machine detector temperature control system, including central control unit, heater, temperature sensor, battery cell, power controller, buffer and circulating fan, wherein the battery cell is connected with central control unit and power controller respectively, and the buffer is connected with the central control unit, and temperature sensor and power controller are connected with the buffer respectively, and heater and circulating fan are connected with the power controller respectively, the CT machine detector is provided with the heat preservation cover outward, and temperature sensor sets up between CT machine detector and heat preservation cover. Although the field adaptability of the temperature control system of the vehicle-mounted shelter CT machine detector is strong, the temperature control system has the defects that the temperature of each module of the CT machine detector cannot be kept in a balanced state for a long time, and the imaging quality of a CT image is poor.

Disclosure of Invention

The invention provides a CT detector temperature balancing device which can keep the temperature of each module of a detector consistent when the detector works and can improve the quality of a CT image, aiming at overcoming the problem that the temperature distribution of the detector is not uniform because the detector is required to be arranged on a CT frame and a fan is required to assist in adjusting the temperature in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme:

the CT detector temperature balancing device comprises a plurality of detectors, a CT rack and a plurality of fans; each detector is fixedly arranged on the CT frame; the edges of the two ends of each detector are respectively provided with a first heating strip and a second heating strip; the CT machine frame is provided with a plurality of mounting castings, and the side walls of the detector are tightly attached with the mounting castings; the first heating strips and the second heating strips are non-uniformly distributed heating strips; the fans are all placed beside the side wall of the detector and are respectively arranged on two sides of the detector together with the mounting castings.

Preferably, the first heating strip is adjacent to the mounting casting; the second heating strip is adjacent to the fan.

Preferably, the heating power density distribution of the first heating strip is not consistent with that of the second heating strip.

Preferably, the heating power density distribution of the first heating strip is gradually reduced from the two ends of the first heating strip to the middle of the first heating strip.

Preferably, the heating power density distribution of the second heating strip is that the heating power density near the fan is higher than that far from the fan.

Preferably, the fans are equally spaced apart on one side of all the detectors.

Preferably, the extending direction of the first heating strip and the second heating strip is the same as the distribution and arrangement direction of the detectors.

Preferably, the first heating strip and the second heating strip each include a plurality of thermal conductive resistors. The heating power density distribution on the first heating strip and the second heating strip is inconsistent by changing the resistance value of each heat conduction resistor.

Compared with the prior art, the invention has the beneficial effects that: (1) according to the invention, a heating device with non-uniform distribution is designed according to the distribution of the heat dissipation power of each CT detector module, so that the temperature of each module can be kept consistent when the detector works, and the image quality is further improved; (2) the invention relates to a self-adaptive temperature compensation heating device which has the characteristics of simplicity and high efficiency.

Drawings

FIG. 1 is a schematic structural diagram of a temperature equalization apparatus of a CT detector in an off-line state;

FIG. 2 is a schematic structural diagram of a temperature equalizing device of a CT detector according to the present invention;

FIG. 3 is a schematic diagram of a configuration of a single longitudinal temperature test point distribution of the probe of FIG. 1;

FIG. 4 is a longitudinal temperature profile corresponding to FIG. 3;

FIG. 5 is a cross temperature profile corresponding to FIG. 3;

FIG. 6 is a temperature profile of the side of the probe of FIG. 2 adjacent the mounting casting;

FIG. 7 is a heating power density profile of the heating strip of FIG. 2 adjacent a side of the installed casting;

FIG. 8 is a temperature profile of the side of the detector of FIG. 2 adjacent the fan;

FIG. 9 is a heating power density distribution diagram of the heating strips of FIG. 2 adjacent to the fan;

FIG. 10 is a longitudinal temperature distribution diagram of the CT detector temperature equalization apparatus in an ideal state according to the present invention;

FIG. 11 is a cross temperature distribution diagram of the CT detector temperature equalizer in an ideal state according to the present invention;

FIG. 12 is a longitudinal temperature distribution diagram of the CT detector in an actual state of the temperature equalizing apparatus of the present invention;

FIG. 13 is a lateral temperature distribution diagram of the CT detector temperature equalization apparatus in an actual state.

In the figure: a detector 101, a first heating bar 102, a second heating bar 103, a mounting casting 104, a fan 105.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention, the following description will explain the embodiments of the present invention with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.

Example 1:

as shown in fig. 1 and 3, the temperature distribution of each detector is first acquired in an off-line state (off the CT gantry) to determine the thermal conductivity efficiency across the detector. In fig. 1, 57 detectors 101, numbered 1-57, are included.

Specifically, as shown in fig. 3, the single detector is set from top to bottom, and the longitudinal temperature test points are A, B, C, D, E, F, G respectively. And the temperature sensors are arranged on the temperature test points, and the specific temperature values of the temperature test points are collected through the temperature sensors. A longitudinal temperature profile as shown in fig. 4 was obtained. As can be seen from fig. 4, the temperatures of the individual detectors are symmetrically distributed in the off-line state. The temperatures of A, G points at two ends are highest, the temperature of D point at the middle is lowest, and the temperature difference is 0.5 ℃.

The temperature acquisition of the longitudinal temperature test points of the above process steps is completed for each detector, and a transverse temperature distribution diagram of the 57 detectors in fig. 1 in an off-line state is obtained, as shown in fig. 5. As can be seen from fig. 5, the temperature is the same for the laterally opposite positions of each detector.

As shown in fig. 2, the CT detector temperature equalization apparatus of the present invention comprises 57 detectors, a CT gantry and 3 fans 105; each detector is fixedly arranged on the CT frame; the edges of two ends of each detector are respectively provided with a first heating strip 102 and a second heating strip 103; the CT machine frame is provided with 3 mounting castings, and the side walls of the detectors are tightly attached with the mounting castings 104; the first heating strips and the second heating strips are non-uniformly distributed heating strips; the fans are all placed beside the side wall of the detector and are respectively arranged on two sides of the detector together with the mounting castings.

Further, the first heating strip is close to the installation casting; the second heating strip is adjacent to the fan.

Further, the heating power density distribution of the first heating strip is inconsistent with that of the second heating strip.

Further, the fans are distributed at equal intervals on one side of all the detectors.

Furthermore, the extending direction of the first heating strips and the second heating strips is the same as the distribution and arrangement direction of the detectors.

Further, the first heating strip and the second heating strip both comprise a plurality of heat conduction resistors. The heating power density distribution on the first heating strip and the second heating strip is inconsistent by changing the resistance value of each heat conduction resistor. The resistance value of the heat conduction resistor can be adjusted by changing the thickness and the length of the heat conduction resistor.

Based on the temperature equalization device of the CT detector shown in FIG. 2, the target temperature is set to be 37 ℃, and the temperature distribution of the detector close to one side of the mounting casting can be obtained through testing and is shown in FIG. 6. The temperature test point of each probe in fig. 6 is point a shown in fig. 3.

In order to maintain consistent temperature, the higher the temperature of the test point, the lower the heating power density of the heating strip corresponding to the point position. The heating power density distribution of the corresponding heating strip, in contrast to the temperature distribution, is shown in fig. 7, where the heating power density at the midpoint is 100, and the heating power density distribution of the entire first heating strip is designed accordingly. As can be seen from fig. 7, the heating power density distribution of the first heating strip gradually decreases from both ends of the first heating strip toward the middle of the first heating strip.

In addition, because no casting is installed on the side of the detector close to the fan for heat dissipation, the influence of the fan mainly causes uneven heat distribution of each detector, 3 fans in fig. 2 are set to operate at 2000RPM, and the temperature distribution diagram of the side of the detector close to the fan is obtained and is shown in fig. 8. The temperature test point of each probe in fig. 8 is the point G shown in fig. 3.

As can be seen from fig. 8, the temperature of the detector closest to the fan is the lowest, only 35 ℃, and the temperature of the detector farthest to the fan can reach 37 ℃, and since all the detectors have 3 fans, the temperature distribution of the detectors according to the interval positions of the fans is as shown in fig. 8.

Likewise, to maintain consistent temperature, the higher the test point temperature, the lower the heating strip heating power density corresponding to that point location. When designing the second heating strip near the fan side, the heating power density is suitably increased at the heating strip near the fan, and the heating power density is reduced at the heating strip far from the fan. The heating power density of the heating strip near the fan is set to 100, and the heating power density distribution of the correspondingly designed second heating strip is shown in fig. 9.

After the designed first heating strips and the second heating strips are installed at corresponding positions (the first heating strips are installed at points a and G of each detector shown in fig. 3, respectively), the longitudinal temperature distribution map and the transverse temperature distribution map of each detector (points a to G in fig. 3) in the CT detector temperature equalization apparatus of the present invention in an actual state are finally obtained. The longitudinal temperature distribution diagram in the actual state is shown in fig. 12, and the lateral temperature distribution diagram is shown in fig. 13.

In the CT detector temperature equalizing apparatus of the present invention, the longitudinal temperature distribution diagram and the transverse temperature distribution diagram of each detector (from point a to point G in fig. 3) in an ideal state are respectively shown in fig. 10 and fig. 11.

As can be seen from fig. 10, the temperatures from the point a to the point G of the single detector are all 37 ℃ in the ideal state, while as shown in fig. 12, the maximum temperature from the point a to the point G of the single detector is 37.05 ℃ at the point a, the minimum temperature is 36.97 ℃ at the point D, and the maximum temperature difference is only 0.08 ℃ in the actual state, so that the actual effect model of the present invention is close to the ideal state model in the longitudinal temperature distribution.

In addition, as can be seen from fig. 11, the temperatures of the points a to G of each detector are 37 ℃ in the ideal state, and as shown in fig. 13, the temperatures of the points a to G of each detector are floated within a certain range in the actual state, wherein the highest temperature value of each point is 37.07 ℃ of the point a, the lowest temperature value of each point is 36.95 ℃ of the point D, the error range from the ideal value of 37 ℃ is only-0.05 ℃ to +0.07 ℃, and the floating range is also small. Finally, the actual effect model of the invention is similar to the ideal state model in the transverse temperature distribution.

According to the invention, the self-adaptive temperature compensation heating device is designed by collecting and analyzing the temperature distribution characteristics of the detectors under the offline and integrated conditions, so that the temperature of each CT detector module is kept in the same or similar temperature distribution, the image quality of CT is improved, and the method has the characteristics of simplicity and high efficiency.

The foregoing has outlined rather broadly the preferred embodiments and principles of the present invention and it will be appreciated that those skilled in the art may devise variations of the present invention that are within the spirit and scope of the appended claims.

Claims

The temperature equalizing device of the CT detector is characterized by comprising a plurality of detectors, a CT rack and a plurality of fans; each detector is fixedly arranged on the CT frame; the edges of the two ends of each detector are respectively provided with a first heating strip and a second heating strip; the CT machine frame is provided with a plurality of mounting castings, and the side walls of the detector are tightly attached with the mounting castings; the first heating strips and the second heating strips are non-uniformly distributed heating strips; the fans are all placed beside the side wall of the detector and are respectively arranged on two sides of the detector together with the mounting castings.
2. The CT detector temperature equalizing apparatus according to claim 1, wherein the first heating bar is adjacent to a mounting casting; the second heating strip is adjacent to the fan.
3. The CT detector temperature equalizing apparatus according to claim 2, wherein the heating power density distributions of the first heating strip and the second heating strip are not uniform.
4. The CT detector temperature equalizing device of claim 3, wherein the heating power density distribution of the first heating strip gradually decreases from the two ends of the first heating strip to the middle of the first heating strip.
5. The CT detector temperature equalizing device of claim 3, wherein the heating power density distribution of the second heating strips is such that the heating power density is higher near the fan than far away from the fan.
6. The CT detector temperature equalizing apparatus of claim 1, wherein the fans are equally spaced on one side of all the detectors.
7. The CT detector temperature equalizing device of any one of claims 1-6, wherein the first and second heating strips extend in the same direction as the detector array.
8. The CT detector temperature equalizing device of any one of claims 1-6, wherein each of the first and second heating strips comprises a plurality of thermally conductive resistors.