Ultra-short pulsed X-ray imaging
View Patent ↗Technologies are generally described for employing ultra-short pulsed X-rays in X-ray computer tomography. Timing parameters of binary modulation applied to the X-rays at the source may be adjusted based on detector characteristics, industry standards, and/or user input. The timing for minimum X-ray intensity during each pulse may be selected to minimize afterglow effect. The timing for the maximum X-ray intensity may then be determined based on one or more of the minimum X-ray intensity timing, desired X-ray dosage, and/or other similar parameters.
1. A method for performing X-ray computer tomography imaging of a subject using pulse modulated X-rays, the method comprising:
determining an X-ray dissipation characteristic of a detector device; and
configuring a timing of a binary modulation applied to the X-rays based on the dissipation characteristic of the detector device such that an afterglow effect of the detected X-rays is substantially minimized by:
adjusting a portion of a degree interval during which a binary modulated X-ray pulse is emitted from a source device at minimum intensity radiation; and
adjusting another portion of the degree interval during which the X-ray pulse is emitted at maximum intensity radiation based on a value of the portion of the degree interval.
2. The method according to claim 1 , wherein the portion of the degree interval is increased in response to at least one from a set of: the detector device detecting X-rays above a predefined threshold, a detection aperture of the detector device being smaller than another predefined threshold, and the detector device being a low quality detector device.
3. The method according to claim 1 , wherein the portion of the degree interval is decreased in response to the detector device being configured to dissipate detected X-ray radiation rapidly.
4. The method according to claim 1 , wherein the portion of the degree interval is determined based on one or more of: receiving dissipation characteristic information from a database and/or receiving dissipation characteristic information by querying the detector device.
5. The method according to claim 1 , further comprising:
determining a portion of the degree interval during which the X-ray pulse is emitted at minimum intensity radiation based on one or more of: a user selection and/or an industry standard;
determining a range for another portion of a degree interval during which a binary modulated X-ray pulse is emitted from a source device based on a value of the portion of the degree interval; and
selecting a detector for the detector device based on the range for the other portion of the degree interval.
6. The method according to claim 5 , wherein the portion and the other portion of the degree interval are selected such that a speed of an X-ray gantry comprising a source device and the detector device is adjustable while the afterglow effect of the detected X-rays is substantially minimized.
7. The method according to claim 1 , wherein the degree interval comprises one-three-hundred-and-sixtieth of a circumference of a circle and a source device and the detector device form part of an X-ray imaging gantry that is adapted to rotate 360 degrees about the subject.
8. An apparatus for attenuating afterglow in medical imaging of a subject, the apparatus comprising:
a detector device;
a source device configured to emit a binary modulated pulse once per a degree interval, wherein a maximum intensity radiation of the pulse is limited to a portion of the degree interval and
a controller device configured to:
determine a dissipation characteristic of the detector device; and
configure a timing of the binary modulated pulse based on the dissipation characteristic of the detector device to substantially minimize an afterglow effect in detected X-rays by one or more of:
adjusting a second portion of a degree interval during which the binary modulated pulse is emitted at minimum intensity radiation from the source device; and
adjusting a first portion of the degree interval during which the binary modulate pulse is emitted at maximum intensity radiation.
9. The apparatus according to claim 8 , wherein the maximum intensity radiation is substantially constant over the first portion of the degree interval.
10. The apparatus according to claim 8 , wherein a minimum intensity radiation is substantially constant over the second portion of the degree interval.
11. The apparatus according to claim 8 , wherein the degree interval comprises one-three-hundred-and-sixtieth of a circumference of a circle.
12. The apparatus according to claim 8 , wherein the emitted binary modulated pulse is X-ray radiation.
13. The apparatus according to claim 8 , wherein the source device and the detector device form part of an X-ray imaging gantry that is adapted to rotate 360 degrees about the subject.
14. An apparatus for controlling an X-ray emitting source device to attenuate afterglow in imaging of a subject through binary modulation, comprising:
a memory configured to store operational parameters associated with a gantry comprising the source device and a detector device;
a processor coupled to the memory, wherein the processor is configured to:
determine a dissipation characteristic of the detector device; and
configure a timing of the binary modulation applied to the X-rays based on the dissipation characteristic of the detector device to substantially minimize an afterglow effect in the detected X-rays by one or more of:
adjusting a second portion of a degree interval during which a binary modulated X-ray pulse is emitted at minimum intensity radiation from a source device; and
adjusting a first portion of the degree interval during which the X-ray pulse is emitted at maximum intensity radiation.
15. The apparatus according to claim 14 , wherein the processor is further configured to control one or more of: a gain of the source device, an exposure time, a rotation speed of the gantry, and/or an angular position of the gantry.
16. The apparatus according to claim 15 , wherein the gain is controlled based on the expression:
G
=
a
*
I
max
+
b
*
I
min
(
a
+
b
)
*
I
max
*
100
,
where “a” is the first portion of the degree interval, “b” is the second portion of the degree interval, “Imax” is a maximum intensity of X-ray emission, and “Imin” is a minimum intensity of X-ray emission.
17. The apparatus according to claim 16 , wherein Imin is set to zero.
18. The apparatus according to claim 16 , the processor is further configured to:
select a minimum value for “b” such that the afterglow effect is substantially minimized; and
adjust “a” to arrive at a desired X-ray intensity level.
19. A non-transitory computer-readable storage medium having instructions stored thereon for attenuating afterglow in medical imaging of a subject, the instructions comprising:
determining an X-ray dissipation characteristic of a detector device;
configuring a timing of a binary modulation applied to the X-rays based on the dissipation characteristic of the detector device to minimize an afterglow effect of the detected X-rays by:
adjusting a second portion of a degree interval during which a binary modulated X-ray pulse is emitted at minimum intensity radiation from a source device; and
adjusting a first portion of the degree interval during which the X-ray pulse is emitted at maximum intensity radiation based on a value of the second portion of the degree interval;
collecting detected X-ray data at a gantry comprising a source device and the detector device rotates around the subject at steps substantially equal to the degree interval; and
generating an image of the subject based on the collected data.
20. The non-transitory computer-readable storage medium of claim 19 , wherein a sum of the first portion of the degree interval and the second portion of the degree interval is substantially equal to the degree interval.
21. The non-transitory computer-readable storage medium of claim 19 , wherein the instructions further comprise:
adjusting the first portion of the degree interval such that a product of the first portion of the degree interval and the maximum X-ray intensity is maintained constant and the maximum X-ray intensity is selected based on a user input.
22. A system for performing X-ray computer tomography imaging of a subject using pulse modulated X-rays, comprising:
a source device configured to emit a binary modulated pulse once per a degree interval, wherein a maximum intensity radiation of the pulse is limited to a first portion of the degree interval;
a detector device configured to receive the emitted the binary modulated pulse; and
a controller operable to configure a timing of the binary modulation applied to the X-rays based on the dissipation characteristic of the detector device to substantially minimize an afterglow effect in the detected X-rays by one or more of:
adjusting a second portion of a degree interval during which a binary modulated X-ray pulse is emitted at a substantially minimum intensity radiation from a source device; and
adjusting the first portion of the degree interval during which the X-ray pulse is emitted at a substantially maximum intensity radiation.
23. The system according to claim 22 , wherein the source device and the detector device are integral parts of a gantry configured to rotate about the subject.
24. The system according to claim 22 , wherein the controller is further configured to control one or more of: an exposure time, a gain, a rotational speed, and/or an angular position associated with the gantry using control signals based on input from one or more of: feedback signals from the gantry, measurement signals from the detector device, and/or a user input.
25. The system according to claim 22 , wherein the controller includes one or more of: a general purpose computing device, a special purpose computing device, and/or a special purpose controller.
26. The system according to claim 22 , wherein the detector device includes one or more of: a scintillator and a solid state photo diode.