X-ray CT device and image display method for parallel imaging process and reconstruction process based on data-preservation process

1. An X-ray CT device comprising:

a bed on which a subject is examined;

a scanner that detects a dose of an X-ray which is applied from a periphery of the subject on the bed and is transmitted through the subject, and acquires X-ray data;

a calculator that performs a predetermined calculation on the X-ray data acquired by the scanner to generate image data;

a storage that preserves at least one of the X-ray data and the image data;

a display that displays an image generated on a basis of the X-ray data; and

a display controller that controls an image to be displayed on the display,

wherein the calculator includes:

a projection data generator that generates, as the image data, projection data on a basis of the X-ray data,

a data preservation processor that preserves at least one of the X-ray data and the projection data in the storage unit in a unit of a predetermined data amount in parallel to an imaging process in the scanner, and also notifies the display controller of a preservation information indicating a progress situation of a preservation process whenever a preservation of the predetermined data amount is completed, and

a reconstruction processor that performs a reconstruction process on the projection data in a unit of a predetermined data amount so as to generate a reconstructed image in parallel to an imaging process in the scanner, and also notifies the display controller of a reconstruction information indicating a progress situation of the reconstruction process whenever the reconstruction process is performed, and

wherein the display controller controls a display timing of a reconstructed image to be displayed on the display on a basis of the preservation information and the reconstruction information.

2. The X-ray CT device according to claim 1 ,

wherein the preservation information includes an angle number of projection data preserved last among pieces of the preserved projection data,

wherein the reconstruction information includes an image number i, wherein i is a positive integer indicating a number of reconstructed images, and

wherein the display controller calculates an angular range required to generate a reconstructed image related to the image number i, and controls a timing of the reconstructed image related to the image number i on a basis of the angular range and the angle number.

3. The X-ray CT device according to claim 2 ,

wherein the display controller calculates the angular range and the angle number by using a number of rotations, R i , and a center angle number T i , obtained according to following Equations (1) and (2):

R i =( Z 0 −( Z 1 +Z 2 )±( L h +λ)+ D ×( i− 1)/ L R   (1)

T i =CEIL(( T f +τ)× R i −δ)−( T h +τ/2)−1  (2)

where i indicates an image number, R i indicates a number of rotations, T i indicates a center angle number, T f indicates an angular range required to create a single image, T h indicates a half range of the angular range required to create a single image, Z 0 indicates a leading image position, Z 1 indicates a leading position of the bed, Z 2 indicates an offset value of a bed position, L h indicates a value of a bed movement amount into which T h is converted, D indicates an image interval, i indicates an image number, L R indicates a bed movement amount per rotation, δ indicates a value for adjusting round-up, λ indicates a value of a bed movement amount into which τ/2 is converted, τ indicates an extended range of an angular range changed depending on an algorithm for an inverse projection process and required to create a single image, and CEIL indicates a round-up function.

4. The X-ray CT device according to claim 1 ,

wherein the preservation information includes an angle number of X-ray data preserved last among pieces of the preserved X-ray data,

wherein the reconstruction information includes an image number i, wherein i is a positive integer indicating a number of reconstructed images, and

wherein the display controller calculates an angular range required to generate a reconstructed image related to the image number i, and controls a timing of the reconstructed image related to the image number i on a basis of the angular range and the angle number.

5. The X-ray CT device according to claim 4 ,

wherein the display controller calculates the angular range and the angle number by using a number of rotations, R i , and a center angle number, T i , obtained according to following Equations (1) and (2):

R i =( Z 0 −( Z 1 +Z 2 )±( L h +λ)+ D ×( i− 1)/ L R   (1)

T i =CEIL(( T f +τ)× R i −δ)−( T h +τ/2)−1  (2)

where i indicates an image number, R i indicates a number of rotations, T i indicates a center angle number, T f indicates an angular range required to create a single image, T h indicates a half range of the angular range required to create a single image, Z 0 indicates a leading image position, Z 1 indicates a leading position of the bed, Z 2 indicates an offset value of a bed position, L h indicates a value of a bed movement amount into which T h is converted, D indicates an image interval, i indicates an image number, L R indicates a bed movement amount per rotation, δ indicates a value for adjusting round-up, λ indicates a value of a bed movement amount into which τ/2 is converted, τ indicates an extended range of an angular range changed depending on an algorithm for an inverse projection process and required to create a single image, and CEIL indicates a round-up function.

6. The X-ray CT device according to claim 1 ,

wherein the reconstruction processor generates a multi-energy image, and

wherein the display controller displays the multi-energy image on the display on a basis of the preservation information and the reconstruction information.

7. An image display method comprising:

an imaging step of detecting a dose of an X-ray, which is applied from a periphery of a subject on a bed and is transmitted through the subject, and acquiring X-ray data;

a calculation step of performing a predetermined calculation on the X-ray data acquired by the imaging step to generate image data;

a storage step of preserving at least one of the X-ray data and the image data; and

a display step of displaying an image generated on a basis of the X-ray data on a display unit,

wherein the calculation step includes:

a projection data generation step of generating, as the image data, projection data on a basis of the X-ray data,

a data preservation processing step of preserving at least one of the X-ray data and the projection data in a unit of a predetermined data amount in parallel to an imaging process in the imaging step, and also performing a notification of preservation information indicating a progress situation of a preservation process whenever a preservation of the predetermined data amount is completed, and

a reconstruction processing step of performing a reconstruction process on the projection data, in a unit of a predetermined data amount so as to generate a reconstructed image in parallel to an imaging process in the imaging step, and also performing a notification of reconstruction information indicating a progress situation of the reconstruction process whenever the reconstruction process is performed, and

wherein the display step further comprises controlling a display timing of a reconstructed image to be displayed on the display unit on a basis of the preservation information and the reconstruction information.