Blur compensation apparatus for X-ray image and medical X-ray imaging apparatus using the blur compensation apparatus

• US 7,187,749 B2
• Filed: 04/24/2003
• Issued: 03/06/2007
• Est. Priority Date: 04/24/2002
• Status: Expired due to Fees

• Current Assignee: J Morita Manufacturing
• Original Assignee: J Morita Manufacturing
• Inventors: Suzuki, Masakazu
• Primary Examiner(s): Glick; Edward J.
• Assistant Examiner(s): Kiknadze; Irakli
• Application Number:
  US10/424,043
• Publication Number:
  US 20030215051A1
• Time in Patent Office: 1,412 Days
• Field of Search: 378/4, 378/19, 378/95, 378/8, 378/39, 378/38, 378/40, 378/62, 378162-165, 250/370.09
• US Class Current: 378/19
• CPC Class Codes: A61B 2562/0219 Inertial sensors, e.g. accelerometers, gyroscopes, tilt switches
• CPC Class Codes: A61B 5/11 Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb for measuring pulse A61B5/02 ;A61B5/1038 takes precedence; motion detection to correct for motion artifacts in physiological signals A61B5/721
• CPC Class Codes: A61B 6/0478 Chairs
• CPC Class Codes: A61B 6/51 for dentistry
• CPC Class Codes: A61B 6/527 using data from a motion artifact sensor
• CPC Class Codes: A61B 6/548 Remote control of the apparatus or devices

Abstract

A blur compensation apparatus for X-ray image of an object to be examined used for a medical X-ray imaging apparatus, which has an X-ray generator and an X-ray imaging device opposite to the X-ray generator, said X-ray generator and said X-ray imaging device interposing therebetween said object held by an object holding means, wherein a sensor means for detecting blur movement of said object is provided near an objective projection position on said object holding means, and wherein a blur compensation process is executed for the X-ray image obtained by said X-ray imaging device, based on a positional change information which is calculated from a detection signal detected by said sensor means during X-ray radiography, said positional change information being the positional change amount with respect to said objective projection position relative to a reference position previously specified on said object holding means.

Claims

1. A medical X-ray imaging apparatus comprising a blur compensation apparatus for X-ray image of a head of an object comprising:

an X-ray generator;

an X-ray imaging device positioned opposite said X-ray generator;

an object holding means interposing said object therebetween said X-ray generator and said X-ray imaging device, wherein

said object holding means comprising a reference position and a head fixing part for fixing the head of an object near an objective projection position;

a sensor means for detecting blur movement of said object fixed on said head fixing part;

said sensor means moves together with said object during X-ray radiography and detects the positional change amount relative to said reference position of said objective projection position, based on any one of accelerated velocity, angular speed, and angle acted on said object holding means, in two directions on a relative moving plane of said imaging apparatus or in two directions parallel to the imaging plane, defined by at least said object and the imaging device when said X-ray generator and said X-ray imaging device are relatively moved for X-ray radiography producing X-ray image of said object;

a blur compensation means executes a blur compensation process on a plurality of two dimensional images based on an image blur movement amount and a deviation of zoom rate calculated from said positional change amount respective to at least said two directions detected by said sensor means for compensating the image of the object, and thereafter

the blur compensation means rearranges and stores a series of X-ray image frames including X-ray image frame of which blur movement is compensated in time series order as in the X-radiography.

2. The blur compensation apparatus as set forth in claim 1, wherein

said object holding means comprises a head fixing part of an object moving means with a chair for holding said object in sitting position, said head fixing part being provided with said sensor, and said reference point being provided at said chair, and wherein

said sensor means detects any one of the accelerated velocity, the angular speed, and the angle acted on said object holding means during X-ray radiography for X-ray image of said object when moving said object moving means.

3. A medical X-ray imaging apparatus for obtaining an X-ray CT image and an X-ray panoramic image of an object to be examined, which has an X-ray generator, an X-ray imaging device opposite thereto, said X-ray generator said X-ray imaging device being rotatable around a rotation center, and an object moving means for moving the object holding means for holding the object at least in a direction parallel to the rotation plane of said rotation, wherein said medical X-ray imaging apparatus has said blur compensation apparatus as set forth in claim 2.

4. The blur compensation apparatus as set forth in claims 1 or 2, wherein

said sensor means comprises two acceleration sensors for detecting the accelerated velocity at said objective projection position with respect to said reference position for two directions orthogonal to each other on a moving plane during X-ray radiography, and wherein

said positional change amount is calculated by executing a dynamic processing based on the acceleration data detected by said two acceleration sensors.

5. The blur compensation apparatus as set forth in claims 1 or 2, wherein

said sensor means comprises two angular speed sensors for detecting the angular speed of said objective projection position with respect to said reference position for two directions orthogonal to each other on a moving plane during X-ray radiography, and wherein

said positional change amount is calculated from the angular speed data detected by said two angular speed sensors.

6. The blur compensation apparatus as set forth in claims 1 or 2, wherein

said sensor means comprises two angle sensors for detecting an angle of inclination of said objective projection position for said reference position for two directions orthogonal to each other on a moving plane during X-ray radiography, and wherein

said positional change amount is calculated from the angle data detected by said two angle sensors.

7. A medical X-ray imaging apparatus for producing an X-ray image of an object to be examined which has an X-ray generator and an X-ray imaging device opposite thereto, said X-ray generator and said X-ray imaging device interposing therebetween said object held by an object holding means;

wherein said X-ray imaging apparatus has said blur compensation apparatus as set forth in claim 1.

8. The medical X-ray imaging apparatus as set forth in claim 7, wherein

said medical X-ray imaging apparatus further comprises an object moving means for moving said object holding means depending on the purpose of X-ray radiography.