Methods and systems for adaptive scan control
First Claim
1. A method, comprising:
- during a single scan of a scan subject in real-time,processing acquired projection data to measure a contrast level;
responsive to the contrast level increasing above a first threshold, automatically switching the single scan from a first scan protocol to a second scan protocol;
responsive to the contrast level decreasing below a second threshold, automatically switching the single scan from the second scan protocol to the first scan protocol;
responsive to the contrast level decreasing below a third threshold, automatically ending the single scan; and
adjusting a temporal sampling rate of the first scan protocol responsive to the contrast level, wherein the first threshold, the second threshold, and the third threshold comprise a threshold contrast level and a threshold rate of change of the contrast level.
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Abstract
Methods and systems are provided for adaptive scan control. In one embodiment, a method comprises: while performing a scan of a scan subject, processing acquired projection data to measure a contrast level; responsive to the contrast level increasing above a first threshold, automatically switching the scan from a first scan protocol to a second scan protocol; responsive to the contrast level decreasing below a second threshold, automatically switching the scan from the second scan protocol to the first scan protocol; and responsive to the contrast level decreasing below a third threshold, automatically ending the scan. In this way, multiple scan protocols, such as angiography and perfusion scan protocols, can be interleaved within a single scan without the use of a separate timing bolus scan.
84 Citations
18 Claims
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1. A method, comprising:
during a single scan of a scan subject in real-time, processing acquired projection data to measure a contrast level; responsive to the contrast level increasing above a first threshold, automatically switching the single scan from a first scan protocol to a second scan protocol; responsive to the contrast level decreasing below a second threshold, automatically switching the single scan from the second scan protocol to the first scan protocol; responsive to the contrast level decreasing below a third threshold, automatically ending the single scan; and adjusting a temporal sampling rate of the first scan protocol responsive to the contrast level, wherein the first threshold, the second threshold, and the third threshold comprise a threshold contrast level and a threshold rate of change of the contrast level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A non-transitory computer-readable storage medium including executable instructions stored thereon that, when executed by a computer, cause the computer to:
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identify a monitoring location of a patient; administer a contrast agent to the patient; perform a single dynamic scan session to acquire image data, wherein during the single dynamic scan session, the executable instructions further cause the computer to; perform a first perfusion scan; monitor a contrast level of the monitoring location based on projection data acquired during the first perfusion scan; responsive to the contrast level above a first threshold, perform an angiography scan; monitor the contrast level of the monitoring location based on projection data acquired during the angiography scan; responsive to the contrast level below a second threshold, perform a second perfusion scan; monitor the contrast level of the monitoring location based on projection data acquired during the second perfusion scan; responsive to the contrast level below a third threshold, end the single dynamic scan session; and reconstruct at least one diagnostic image based on one or more of the first perfusion scan, the second perfusion scan, and the projection data acquired during the angiography scan. - View Dependent Claims (11, 12, 13)
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14. A system, comprising:
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an x-ray source that emits a beam of x-rays toward an object to be imaged; a detector that receives the x-rays attenuated by the object; a data acquisition system (DAS) operably connected to the detector; and a computer operably connected to the DAS and comprising non-transitory memory storing instructions that, when executed, cause the computer to; during a single scan in real-time, process projection data received from the DAS to measure a contrast level; and automatically interleave at least two scan protocols during the single scan responsive to the contrast level, wherein automatically interleaving the at least two scan protocols comprises switching from an acquisition of the projection data according to a first scan protocol of the at least two scan protocols to an acquisition of the projection data according to a second scan protocol of the at least two scan protocols, and then back to the acquisition of the projection data according to the first scan protocol at least once during the single scan, wherein the first scan protocol is a perfusion scan protocol and the second scan protocol is an angiography scan protocol. - View Dependent Claims (15, 16, 17, 18)
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Specification