Apparatus and method for cone beam volume computed tomography breast imaging
Cone beam volume CT breast imaging is performed with a gantry frame on which a cone-beam radiation source and a digital area detector are mounted. The patient rests on an ergonomically designed table with a hole or two holes to allow one breast or two breasts to extend through the table such that the gantry frame surrounds that breast. The breast hole is surrounded by a bowl so that the entire breast can be exposed to the cone beam. Spectral and compensation filters are used to improve the characteristics of the beam. A materials library is used to provide x-ray linear attenuation coefficients for various breast tissues and lesions.
1. A device for producing an image of a breast of a patient, the device comprising:
a gantry frame;
at least one motor for moving the gantry frame to form a data acquisition geometry in which image data are taken;
a source of a beam of radiation attached to the gantry frame to move with the gantry frame;
a two-dimensional (2D) digital detector attached to the gantry frame to move with the gantry frame, the 2D digital detector being disposed in a path of the beam of radiation; and
a table on which the patient rests while the image data are taken, the table supporting the patient such that the breast is disposed between the source of cone-beam radiation and the 2D digital detector, the table having a hole through which the breast extends and being configured such that an entirety of the breast extending through the hole is in the path of the beam of radiation;
wherein the at least one motor moves the gantry frame so that the 2D digital detector takes a volume scan of the breast; and
wherein the table has a second hole to permit an arm of the patient to drop through the second hole while the volume scan is taken.
2. The device of claim 1 , wherein the device performs a scan geometry to avoid the patient's arm.
3. The device of claim 1 , wherein the at least one motor moves the table laterally and longitudinally relative to the gantry to reposition the patient for a new scan.
4. The device of claim 1 , further comprising an intensity modulator to reduce the radiation dose to the patient while achieving the uniform image quality of projections.
5. The device of claim 4 , further comprising a computer-controlled collimator for reducing a radiation dose to the patient.
6. The device of claim 1 , wherein the table has two breast holes and two arm holes.
7. The device of claim 6 , wherein the at least one motor moves the table laterally and longitudinally relative to the gantry to reposition the patient for a new scan.
8. The device of claim 6 , wherein the gantry frame and the table are configured such that the volume scan is taken of both of the patient's breasts in a single scan.
9. The device of claim 6 , wherein the detector is sized to scan both of the patient's breasts in a single scan.