JPH04246340A - X-ray image diagnostic device - Google Patents

Abstract

PURPOSE:To allow the sampling timing of a living body signal of pressure in the heart, etc., to coincide exactly with a recording time point of each image by generating a living body signal sampling pulse by a time phase of substantial half of an X-ray exposure pulse and executing the sampling of the living body signal. CONSTITUTION:A read-in instruction generating circuit 14 is operated, when a signal is applied from a digital signal processor 7. An X-ray exposure signal applied to an X-ray high voltage device 5 from an X-ray controller 4 is sent to the digital signal processor 7, as well, and this digital signal processor 7 detects the time of half s pulse width of its X-ray exposure signal or the time for halving an integral area of a waveform of a single X-ray exposure signal containing a wave tail, as well, and sends the signal to the read-in instruction generating circuit 14 at that time. The read-in instruction generating circuit 14 generates a read-in instruction in accordance with its signal, and can generate the read-in instruction which rises at such a timing as just halving the X-ray exposure signal.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray image diagnostic apparatus.

0002

[Prior Art] Conventionally, contrast imaging of blood vessels has been performed using cine film or digital cine photography, the volume of the heart has been determined from each image, and the intracardiac pressure has been measured at each point in time when those images were taken. and the pressure of the subject's heart.
Volume curves are determined and used for clinical analysis.

[0003] At this time, pressure data at the time when the image is taken is obtained by marking the start of contrast imaging on the polygraph. That is, the elapsed time is determined based on the number of images from the mark, and data at that elapsed time is imported.

0004

[Problems to be Solved by the Invention] However, when reading the polygraph visually, there is a problem in that the read pressure data and the time when the image was taken tend to be out of sync or out of phase. In particular, when calculating the pressure-volume curve of the heart, it is important to draw the curve using the accurate intracardiac pressure at the time the image was recorded. It is not possible to obtain a volume curve, which in turn poses a problem in the accuracy of diagnosis.

[0005] In view of the above, an object of the present invention is to provide an improved X-ray image diagnostic apparatus that can accurately match the sampling timing of biological signals such as intracardiac pressure with the recording time of each image. do.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the X-ray image diagnostic apparatus according to the present invention generates a biological signal sampling pulse at substantially half the time phase of the X-ray exposure pulse to It is characterized by sampling the signal. Because biological signals are sampled using a pulse that occurs at substantially half the time phase of the X-ray exposure pulse, known as a sampling pulse, there is a time lag between the image recording time and the biological signal sampling time. This eliminates the possibility of phase shift and enables more accurate analysis of clinical data.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an embodiment in which the present invention is applied to a digital angio apparatus. This digital angiography device performs cardiac angiography and calculates the volume of the heart from the image, and also measures the pressure inside the heart at the time the image is taken, and calculates the pressure-volume curve of the heart for clinical analysis. .

In FIG. 1, a subject 1 is irradiated with X-rays from an X-ray tube 2 in a pulsed manner. X transmitted through object 1
The ray beam enters an X-ray imaging device 3, which is a combination of an image intensifier and a TV camera, and an image signal of an X-ray transmission image is obtained. After this image signal is converted into digital data via the A/D converter 6,
The signal is taken into the digital signal processing device 7 and recorded in a recording device therein. A high voltage is supplied to the X-ray tube 2 from an X-ray high voltage device 5, and this X-ray high voltage device 5 is controlled by an X-ray control device 4.

On the other hand, the intracardiac pressure of the subject (patient) 1 is
It is measured by an intracardiac pressure measuring device 8 attached to the tip of the catheter and inserted into the heart. In addition, by pasting electrodes on the body surface of the subject 1, the electrocardiograph 9
The electrocardiogram waveform is measured. After these pressure data and electrocardiographic waveforms are held by holding circuits 10 and 11,
The data is converted into digital data by A/D converters 12 and 13, respectively, and sent to the digital signal processing device 7. These holding circuits 10 and 11 and A/D converters 12 and 13 operate at timings according to a read command generated from a read command generation circuit 14.

The read command generation circuit 14 operates upon receiving a signal from the digital signal processing device 7. X
The X-ray exposure signal given from the radiation control device 4 to the X-ray high voltage device 5 is also sent to the digital signal processing device 7, and this digital signal processing device 7 uses half the pulse width of the X-ray exposure signal. , or the time at which the integral area of the waveform of one X-ray exposure signal including the wave tail is halved, and the signal is sent to the reading command generation circuit 14 at that time. The read command generation circuit 14 generates a read command in response to the signal. As a result, as shown in FIG. 2, it is possible to generate a read command that rises at a timing that exactly divides the X-ray exposure signal into two.

The holding circuits 10 and 11 hold the signal at the rising edge of this read command, and this signal is sent to the A/D converter 12.
, 13, it is converted into digital data. When the X-ray exposure signal is rising (shaded area in Figure 2), X-ray exposure is being performed, and the image data of the X-ray transmission image obtained from that single exposure is processed by the digital signal processing device. 7, the intracardiac pressure data and electrocardiographic waveform data can be held at a timing that matches the timing at which the image data is captured. The data thus held will be recorded in the memory area in the digital signal processing device 7 in association with the image data at the time when the image data has been captured. As a result, a more accurate pressure-volume curve of the heart can be obtained, which is very useful for clinical analysis.

[0012] In the above embodiment, intracardiac pressure data and electrocardiographic waveforms are recorded together with images as biological signals, but other biological signals may also be recorded in synchronization with image recording. It is applicable and can provide accurate data for clinical analysis.

[0013]

[Effects of the Invention] As described above with respect to the embodiments,
According to the X-ray image diagnostic apparatus of the present invention, biological signals can be captured in accurate synchronization with the X-ray exposure signal that controls the pulsed X-ray exposure, and the biological signals can be captured in a manner that completely coincides with the time of image recording. The time and phase can be recorded together with the image, enabling accurate clinical analysis.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an X-ray image diagnostic apparatus according to an embodiment of the present invention.

FIG. 2 is a time chart for explaining the operation of the same embodiment.

[Explanation of symbols]

1 Subject 2
X-ray tube 3
X-ray imaging device 4
X-ray control device 5
X-ray high voltage device 6, 12, 13 A/D converter 7 Digital signal processing device 8 Intracardiac pressure measuring device 9 Electrocardiograph 10,
11 Holding circuit

Claims (1)

[Claims] 1. An X-ray irradiating means for irradiating X-rays in a pulsed manner to a subject; means for recording a transmitted image of the subject by the pulsed X-rays; means for measuring a biosignal for, a means for generating a sampling pulse at a substantially half time phase of the X-ray exposure pulse, and a means for sampling the measured biosignal in response to the sampling pulse. An X-ray image diagnostic apparatus comprising: means for recording in relation to the recorded transmission image.