JPS5897349A - Ultrasonic diagnostic apparatus of sector scanning type - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to a sector-scanning dust ultrasonic diagnostic apparatus in which the scanning area is fan-shaped. The aim is to simultaneously obtain standard television scanning video signals that are easy to record.

(2) Background of the Technology Ultrasonic diagnostic apparatuses are broadly classified into sector scanning type and linear scanning type depending on their scanning method. Sector scanning panels are suitable for diagnosing diseases such as the heart, and are classified into X-Y deflection type and standard television scanning type depending on the display method. Figure 1 is a schematic block diagram of an ultrasonic diagnostic apparatus using an x-y deflection type CRT (cathode ray tube) 1, and Figure 2 is an explanatory diagram of its operation. The ultrasonic transmitting/receiving and signal processing device 2 has a sector scanning type ultrasonic probe 2a shown at 1121@l, from which ultrasonic pulses are sequentially emitted at different angles. '1 e Bt
u...-- are scanning lines formed by these ultrasonic pulses. The reflected waves of each ultrasonic pulse by the living tissue are received by the device 2, further periodically sampled, subjected to M/D (analog, digital) conversion, and converted into a digital signal. 6 is a storage device that can store one frame of digital values from the device 2, and this output is D/A (digital, analog) converted by the video signal generator 4.
-Displayed on a Y-biased CRT 11C. 5 is an overall control section.

Writing to the storage device 3 in this apparatus is performed in correspondence with scanning lines in the order K % m Wle Wl . . . as shown in FIG. Multi-scanning line as(i=
1.2...) The digital values obtained by 4-(RAW) address specification W1 of the memory are used in the following order: Sl to horse, St to W, etc. Addressing is performed and read in the same manner, -9...
It is carried out by... Since the CRTl is of the X-Y deflection type, the deflection signal generator 1a converts the electron beam into a scanning line and
81'*Bt'*-"... In other words, if the ultrasonic scanning line is deflected in the same way as 816 ato...... and the brightness is modulated, the ultrasound in the ultrasound sector scanning area of the living body will be reflected. The reflected wave of the ultrasonic pulse may be directly used as the brightness modulation signal of the CRT 1, and therefore the storage device 3 is used for freezing (still images).

FIG. 5 is a schematic block diagram of an ultrasonic diagnostic apparatus using a standard television scanning type CRT 1', and FIG. 4 is an explanatory diagram of its operation. In the ultrasonic diagnostic apparatus of this example, the probe 2 is a sector scanning type and the CBT 1' is a standard television scanning type, so a storage device 5' for one frame for scanning method conversion is essential.
o◆. In other words, the memory address generation circuit 6 uses different address designations I11 during writing and reading, and scans IIi! using ultrasonic pulses during writing. Byo, S2. ...
−・corresponding to w,', w,'.

Irregular addressing is performed as shown in the following, and when reading, scanning lines g, #, and 8 are used by the electron beam.
In response to 1'*"-..., Rj e &I we...
・Specify the address in the same way as in Figure 2.

(3) Prior art and problems When trying to record images on a standard television scanning type video tape recorder (VTR) 11 using the above-mentioned ultrasonic diagnostic apparatus, the scanning method is different in the example shown in Fig. 1, so standard television scanning is used. It is necessary to carry out scan conversion to photograph the CRTl screen' with the TV camera 10 of the formula.

However, this TV camera 10 is expensive, and the image quality deteriorates.
This is not a good idea in terms of backlight noise, compactness, etc. On the other hand, in the example shown in Figure 3, the input of CRTi/ is directly
Since it can be input to TR11, a TV camera is not required.

However, the quality of the image is worse than that of the X-Y deflection type CRT 1. This is done by writing W as shown in Figure 814.
1'9%', . . . When a plurality of memory cells intersect the W and '1%' lines, one of the closest ones is selected, etc., for scanning *8t.

S2. This is because quantization noise due to address conversion occurs when combining . . . , and as a result, moiré fringes appear on the image. Furthermore, when writing is performed as shown in FIG. 4, there is a drawback that an unused area is generated in the storage device 3' (the portion of the rectangle circumscribing the fan shape other than the fan shape is not used). Furthermore, if the storage device 3' is for one frame, writing and reading to and from the CRT 1' are performed in parallel, so that scanning fig.8. 'e 8＊'＊・・・・・・・・・
- There is data for the current and previous two frames of sector scanning at the top, and there is also the drawback that the data is mixed and displayed.

(4) Purpose of the Invention The present invention provides an X-Y scanning video signal with good image quality and a VT
Standard TV scanning video signals suitable for R recording can be obtained at the same time, storage devices can be used efficiently, and the ultrasonic sector scanning is synchronized frame by frame, so current scanning output and previous scanning output are mixed. You won't be able to get a standard TV scanning signal,
The present invention provides a sector scanning type ultrasonic diagnostic device.

(5) Structure of the Invention The basic structure of the present invention is to sequentially emit ultrasonic pulses at specific angles at a predetermined period to scan within a certain angle, and to generate reflected waves sequentially obtained by the scanning at a predetermined period. In a sector-scanning ultrasonic diagnostic device that has the function of sampling, converting it into a digital value by D conversion, and storing it in a storage device for a display device, each digital value for one frame is First and second storage devices are provided that can store data arranged in sector scanning order, writing to these storage devices is performed alternately in frame units, and reading from the storage device currently being written is performed in the same manner as the writing. Addressing is performed from the other storage device with a delay of a predetermined time, and addressing is performed from the other storage device in a standard television scanning system signal arrangement, and these digital values are converted back to analog values and converted into X-Y deflection type. The present invention is characterized in that a video signal suitable for display and a video signal suitable for standard television display delayed by one frame from the video signal suitable for display are simultaneously obtained.

(6) Embodiments of the Invention Hereinafter, the present invention will be explained in detail with reference to the illustrated embodiments. FIG. 5 is a block diagram showing an embodiment of the present invention, in which the same parts as in FIG. 1 etc. are given the same reference numerals. The ultrasonic transmitting/receiving and signal processing device 2 transmits/receives a sector scanning type ultrasonic probe 2a1, and outputs the output of the mu/D converter 2d (
Digital values) are alternately written into the storage device in units of 3 or 5 mK7 rams through the switch SW. Three of these storage devices.

Writing to 3mK is performed using the same addressing method using the X-Y type address generation circuit 6m, but for reading, the addressing method is different between the storage device currently being written to and the large storage device. Make it different. Tsumashi,
While the switch sw is writing the digital values for 17 reams into one storage device 3m as shown in the figure, the
By specifying an address (by switch 8W), data is immediately read from the storage device 3 by writing in blanks or by repeating writing and reading for each #i1 sample data. On the other hand, the other storage device 31 is given the standard TV address and address from the address generation circuit 6 by the switch 8W, and the X-Y! ! $1
The scanning method is converted and read out so that the data of the previous frame written with the specified address becomes data for standard TV. The data to be read from the storage device 3m is guided through the switch 8W4 to the X-Y visual signal generation unit 4 by the address specification of the address generation circuit 6m, and the data that is not read from the storage device 3m is specified by the address specification of the address generation circuit 6m. The data read from the switch BWI is led to the standard television video signal generation section 4'.Switches SW1 to SW8W
, alternately switches between the condensed line position and the broken line position every 7 frames, so in the next frame, the output of the storage device 31 passes through the switch 8W to the creation unit 4/, and the output of the storage device 31 passes through the switch 8W. is led to the creation section 4 through .

Figure 11g6 is an explanatory diagram of the operation of the first storage device 3m in state 11 (assumed to be the first frame of sector scanning) with the switches 8W and -8W= switched to the solid line positions.

When the ultrasonic probe 2a sequentially emits ultrasonic pulses and performs sector scanning of the first frame using the scanning line B*=fk-"・-S, the force conversion unit Time-series signals are generated sequentially corresponding to the scanning lines from 2d onwards.Writing and reading from the storage device 3m of the 17th frame are both performed by the X-YIIi address designation from the address generation circuit 6m.

That is, the first scanning line 8. #c After writing the corresponding time series signal to the storage element in the first column (Wl), write the time series signal corresponding to the second scanning line B to the memory element in the second column (h) , together with the first scanning line s from the i storage element of the first column
Read out the time series signal corresponding to 1 (B□).

However, it is not possible to write and read to the same memory at the same time, so write (-) out of (R1) that has been read for one line, or write every sample data,
Repeat reading 9. In this example, the former is selected, so writing and reading are W, -R, -Tsuru-B, ---------
The order is WH-RN. Then, the read data D/with a write delay of one scanning period (this delay can be ignored in practice) is displayed on the X-Y deflection type CRT. CRT
1's 81'e BtZ... The song corresponds to the sector scan at- as described above. Of course, the video signal to CRT 1 is M/D f
It may be the analog output itself from the probe 2a before replacement, and the storage device 3m e1m is used for freezing for the C, RTI&C.

FIG. 7 shows the operation theory fIA@ regarding the storage device 5mk of jlr2 in the first frame of the above-mentioned nine+ctor scan. This storage device 31 stores the previous frame, in this example, the 0th frame.
The time series signal of the frame is W with X-Y type addressing.
,, W, , -----...WM are written in this order. In the standard television scanning type CRT1', 525 scanning lines are scanned in the horizontal direction, and in the case of interlace, 8! 't 84'l ”-”-
Interlaced scanning is performed in the order of "*8t's 8s's""-". Therefore, regardless of whether interlacing is performed or not, data must be read from the storage device 3m by specifying addresses that support fan scanning as shown in Figure 6.
・−・) will give meaningless results.

In this case, as shown in Fig. 7(b) and (e), the period during which kcRT1' (K = 1, 2, 3---...) (D scan 11748) (H8 is a horizontal synchronizing signal) runs. Then, the line Sx is the sector scanning line 81fe8,...
Points that intersect with ・・・・・・■,■,■,・・・・・・
Find the address on memory 3, 31, and read the memory at the address at timing 1. ．． 1 goose, Hatake +++ * +++
Use an irregular address specification of reading with +++. This is performed using a standard TV sub-address generation circuit, but it can be easily constructed by using the following circuits.

That is, the counter circuit 31 counts the output of the oscillation circuit 5o, and each time the count reaches a certain value, the decoder circuit 32 generates a television synchronization signal (vertical and horizontal). At the same time, when the count value of the counter circuit 310 reaches a value corresponding to time t1 of scan 1ist' shown in FIG.
Access the OM 33 and retrieve data from the storage device 31.
Generates a read address to output. In other words, K10M33 is set as such. ! If you compare Figure 8 and Figure 5, it is an oscillation circuit! The IO and counter circuit 31 are included in the control unit 5, the decoder circuit 52 is the main part of the standard TV synchronization signal generation part 1m', and the ROM 53 is the main part of the address generation circuit 6.

Next, the sector scan becomes the second frame.2 Switches 8W and ~SW in the fifth diagram are all switched to the dashed line position)
, the time series signal of the second frame is written to the second storage device 3mK. The data D' in this storage device 31 is
is immediately read out and displayed on CBT 1. At this time, data DI of the first frame μ, which is one frame before, is read from the storage device 3 by specifying an address for standard television and displayed on the CRT'.

Thereafter, the above-described operation is repeated while switching the switches SW1 to SW8WI alternately at the frame period.

(7) Effects of the Invention As described above, according to the present invention, in an ultrasonic diagnostic apparatus with a sector scanning lid, the reproduced image is a clear X-Yll video signal and a standard television scanning method video suitable for VTR fi images. Since the signals can be obtained at the same time, a TV camera or the like is not required for VTR recording, and immediate diagnosis can be made with clear images.

If you just want to achieve your goal, a storage device of 17x15 minutes for scanning format conversion is sufficient. However, in this case, while writing to the same storage device using x-y deflection type addressing, reading is simultaneously performed using standard television scanning type addressing, so the resulting video signal has two frames of sector scanning. Nine new and old data are mixed.However, in the present invention, a storage device for two frames is used.
This allows for frame synchronization between sector scanning and standard television scanning. In this case, there is a delay of one frame, but one frame of sector scanning! ioml
Since it is l@degree, this delay can be ignored in practical terms. Even if a storage device for only two frames is used, writing is always KX.
-Ylii address designation, there is no unused area in the storage device as shown in FIG. 4, which has the advantage of requiring a small capacity.

[Brief explanation of drawings]

Figure 1 is a schematic block diagram of a conventional sector scanning type ultrasonic diagnostic device that uses a CRT with X-Y uneven thickness, Figure 2 is an explanatory diagram of its operation, and Figure 3 is a conventional sector scanning type CRT that uses a standard television scanning type CRT. 4 is a schematic block diagram of a sector-scanning ultrasonic diagnostic apparatus, FIG. 4 is an explanatory diagram of its operation, FIG. 5 is a block diagram showing an embodiment of the present invention, and FIGS. 6 and 7 are its operations. The explanatory diagram, FIG. 8, is a pull diagram showing a specific example of a circuit necessary for generating a standard television signal. In the figure, 1 is an X-Y deflection type CRT, 1' is a standard TV type C12, 2m is a sector scanning type ultrasound probe, 2d is a Mu/D converter, 3mu is the first and a second storage device;
6m is an X-Yg address generation circuit, and 6m is a standard TV child address generation circuit 11 of V'j'R. Applicant: Fujitsu Ltd. Representative Patent Attorney Minoru Yanagi Minoru Mafu (b) (C) He s, 11-1111

Claims (1)

[Claims] Ultrasonic pulses are sequentially emitted at a specific angle at a predetermined period to scan within a certain angle, and the reflected waves sequentially obtained by the scanning are sampled at a predetermined period and converted into digital values by D conversion. In a sector scanning ultrasonic diagnostic apparatus having a function of storing data in a storage device for a display device, first and second storage devices are each capable of storing digital values for one frame in a form arranged in sector scanning order. Writing to these storage devices is performed alternately on a frame-by-frame basis, and reading from the storage device currently being written is performed in the same manner as the writing, with a delay of a predetermined period, and then to the other storage device. From the device, each address is specified as a standard television scanning signal arrangement, and these digital values are converted back to analog values to produce an Eirin signal suitable for X-Y deflection type display and one frame from that. A sector scanning type ultrasonic diagnostic apparatus characterized in that it is configured to simultaneously obtain a video signal compatible with standard television display with a delay of 1 minute.