Data acquisition
AssigneeKoninklijke Philips Electronics N.V.
InventorRoland Proksa
Life of this patent
Estimating the term…
Abstract
An imaging system includes at least one radiation generating component (210) that alternately emits different radiation that traverse an examination region and a common detector (214) that detects radiation that traverses the examination region and generates a signal indicative thereof. Pulse generating circuitry (304) generates a pulse train, including a plurality of pulses, with a frequency indicative of the signal for the at least one radiation generating component (210) for a sampling interval. Processing electronics (220) determine an approximation of the signal for one of the at least one radiation generating components (210) for the sampling interval based on a number of pulses in the pulse train for the sampling interval and charge of the pulses in the pulse train.
Claims25
An imaging system, comprising:
- at least one radiation generating source that is selectively turned on and off so as to alternately emit radiation that traverse an examination region;
- a common detector that detects radiation that traverses the examination region and generates a signal indicative thereof;
- pulse generating circuitry that generates a pulse train, including a plurality of pulses, with a frequency indicative of the signal;
- and
- processing electronics that determine an approximation of the signal for the at least one radiation generating source for a sampling interval based on a number of pulses in the pulse train for the sampling interval and charge of the pulses in the pulse train, wherein the processing electronics calculate a first contribution to the approximation for a first range of pulses from a first pulse in the sampling interval to a last pulse in the sampling interval, and estimates a second contribution to the approximation for a second range of pulses from the last pulse in the sampling interval to an end of the sampling interval, wherein the second contribution is estimated based on charge from the first contribution.
A method, comprising:
- detecting first radiation being emitted during a first sub-set of a first sampling interval;
- generating a signal indicative of the detected radiation and of a decaying afterglow signal produced during a second subsequent sub-set of the first sampling interval in which the first radiation is not being emitted;
- clearing the integrated signal during a third subsequent sub-set of the first sampling interval;
- integrating the signal over the first, second and third sub-sets to generate an integrated signal;
- generating pulses for the first sampling interval with a frequency indicative of the integrated signal;
- and
- determining, with processing electronics of an imaging system, an approximation of the signal based on the generated pulses, including calculating a first contribution for a first time period of the first sampling interval up to the clearing of the integrated signal and estimating a second contribution for a second time period of the first sampling period beginning with the clearing of the integrated signal.
A stereo tube imaging system, comprising:
- first and second radiation sources arrange at about a same angle and offset along a z-axis direction, wherein the first radiation source emits first radiation during a first integration interval and the second radiation source emits second radiation during a second integration interval;
- a detector array that detects the emitted radiation and generates a signal indicative thereof;
- integrating circuitry that integrates the signal;
- a reseter that resets the integrating circuitry prior to an end of each integration interval;
- pulse generating circuitry that generates a pulse train, including a plurality of pulses, with a frequency indicative of the signal for each integration interval;
- and
- a partial charge determiner that determines charge for a first portion of the first integration interval up to a last pulse before the reset based on a number of pulses in the first integration interval up to the last pulse;
- and
- a missing charge determiner that determines charge for a second portion of the first integration interval that begins with the last pulse of the integration interval and ends at an end of the integration interval.
A method for approximating a signal indicative of detected radiation over a sampling interval, comprising:
- generating pulses with a frequency indicative of an integration of the signal;
- calculating a first contribution from a first pulse in the sampling interval to a last pulse in the sampling interval;
- calculating a second contribution after the last pulse of the sampling interval to an end of the sampling interval based on a decay constant determined from the sampling interval;
- and
- calculating, with processing electronics of an imaging system, a total contribution by adding the first and second contributions.
Dependencies are inferred from the claim text.