Ultrasonic tomographic with alternate image scaling

An ultrasonic tomograph comprising:

• (1) display means, having two display areas, for respectively simultaneously displaying a first and a second tomographic images;
• (2) display marker producing means for producing a display marker which can be moved on said display area of said first tomographic image, for designating an area to be displayed as said second tomographic image;
• (3) ultrasonic transducer means for emitting ultrasonic waves to an object to be examined in a sector scanning mode and for receiving reflected ultrasonic waves which have been reflected from said object;
• (4) driving means for driving said ultrasonic transducer at first and second scanning angles, respectively corresponding to angles to produce said first and second tomographic images;
• (5) angle detection means for detecting an angle of said ultrasonic transducer means and for producing analog angle information signals;
• (6) imaging means for converting said reflected ultrasonic waves from said object of said ultrasonic transducer to analog image signals;
• (7) first A/D converter means for converting said analog image signals of said imaging means into digital image data;
• (8) second A/D converter means for converting said analog angle information signals of said angle detection means into digital angle information data;
• (9) address conversion means for compressing said digital angle information data from said second A/D converter means corresponding to said first tomographic image at a first predetermined ratio;
• (10) memory means for storing:
• (a) in a first part thereof, said digital image data of said first A/D converter means corresponding to said first tomographic image by using said compressed digital angle information data from said second A/D converter means corresponding to said first tomographic image, and (b) in a second part thereof, said digital image data of said first A/D converter means corresponding to said second tomographic image by using said digital angle information data of said second A/D converter means without said compressing said data being used for displaying on said display means;
• (11) timing signal generator means for generating a timing signal to be used for controlling said ultrasonic transducer means, said driving means, said angle detecting means, said transfer means, said first and second A/D converter means, said address conversion means, and said memory means;
• (12) an address data correction means having:
• (a) first latch means for storing a value corresponding to data indicative of a start angle of sector scanning by said ultrasonic transducer means;
• (b) second latch means coupled to said timing signal generating means for storing a changing value which is initially equal to said value stored in said first latch means, and includes means for incrementing said changing value by a certain value each time said timing signal is produced by said timing signal generating means;
• (c) third latch means for storing a value corresponding to angle data of an end angle of sector scanning of said ultrasonic transducer means;
• (d) first comparator means for comparing said digital angle information data with said value stored in said first latch means and for producing an output indicative of said value stored in said first latch means when said digital angle information data is less than or equal to said value stored in said first latch means;
• (e) second comparator means for comparing said digital angle information data with said value stored in said second latch means and for issuing a control signal when said digital angle information data is greater than said value stored in said second latch means;
• (f) third comparator means for comparing said digital angle information data with said value stored in said third latch means and for issuing a signal for shifting said value stored in said second latch means to a value corresponding to said value stored in said first latch means when said digital angle information data is greater than said value stored in said third latch means;
• and
• (g) means for providing said certain value to said incrementing means when said second comparator means issues said control signal.

An ultrasonic diagnosis apparatus comprising:

• an ultrasonic scanning set having:
• an ultrasonic transducer means, for emitting ultrasonic waves to an object to be examined in a sector scanning mode and receiving a reflected wave thereof;
• an electric motor for driving said ultrasonic transducer;
• angle detection means for generating an angle signal corresponding to an angle of said ultrasonic transducer means;
• ultrasonic transceiver means for providing an ultrasonic signal to said ultrasonic transducer means and receiving a received signal based on a reflected ultrasonic wave from said object to be examined;
• a first A/D converter for A/D converting said received signal;
• a second A/D converter for A/D converting said angle signal;
• compressed data operation means for producing compressed data corresponding to a selected divided scanning range, based on said output of said first and second A/D converters;
• address conversion means for producing converted addresses corresponding to said selected divided scanning range;
• and
• display means for displaying at least a tomographic image produced by utilizing image data which is read out using said converted address.

An ultrasonic diagnosis apparatus comprising:

• an ultrasonic scanning set having:
• ultrasonic transducer means for emitting ultrasonic waves to an object to be examined in a sector scanning mode and receiving a reflected wave thereof;
• a first electric motor for driving said ultrasonic transducer means in a first scanning direction;
• a second electric motor for driving said ultrasonic transducer in a second scanning direction;
• first angle detection means for generating a first angle signal responding to angle of said first scanning of said ultrasonic transducer;
• a second angle detection means for generating a second scanning of said ultrasonic transducer means;
• motor control means for controlling said first and second motors;
• display means for storing said received signal from said ultrasonic transducer in a graphic memory, and for displaying two ultrasonic tomographic sectional planes by utilizing said received signal;
• address conversion means for producing a converted address corresponding to said selected divided scanning range, corresponding to said first angle signal and said second angle signal;
• and
• a ROM which stores displaying information as a function of address corresponding to said converted address generated by said address conversion means, and for providing said displaying information to said display means.