Method and arrangement relating to x-ray imaging
AssigneeSectra Mamea AB
InventorMagnus Aslund
Life of this patent
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Abstract
The present invention relates to a method and arrangement for controlling exposure in an e-ray apparatus, for depicting an object. The apparatus comprises an x-ray source and a displaceable detector being arranged to move with a controllable speed across an image exposure area. The method comprises the step of: acquiring a signal relating to photons incident on at least a part of the detector, comparing said acquired signal with a target value, and controlling the speed of detector, displacement with respect to the result of the comparison.
Claims30
A method of controlling exposure in an x-ray apparatus, for imaging an object, the apparatus comprising an x-ray source and a displaceable detector being arranged to move with a controllable speed across an image exposure area, the method comprising the steps of:
- starting a first scan and acquiring a signal relating to photons incident on at least a part of the detector,
- comparing said acquired signal with a target value, and
- controlling the displacement speed of detector with respect to the result of the comparison during said first scan.
A method of controlling exposure time in an x-ray apparatus, the method comprising the steps of:
- a. setting a target signal (400),
- b. setting a detector Region Of Interest (ROI) (401),
- c. setting a start velocity (402),
- d. start scanning (403),
- e. collecting a signal from said ROI (404),
- f. compensating the signal with respect to at least one of ROI size and efficiency (405),
- g. comparing the signal with a target signal (Starget) and calculating a new optimal velocity (406), and
- h. setting a new velocity during said scanning.
An arrangement for controlling exposure time in an x-ray apparatus (100), which comprises an x-ray source (110) and a displaceable detector (150), being arranged to be displaced with a controllable speed across an image exposure area,
- characterised in
- that the arrangement comprises means (802) for receiving detected signals by said detector, which includes a comparator unit for comparing said acquired signal with a target value during a scan, and means (804) for controlling the speed of said detector displacement during said scan with respect to the result of the comparison.
An X-ray apparatus (100) of a photon counting type, comprising an x-ray source (101) and a displaceable detector (105) being arranged to move with a controllable speed across an image exposure area, characterised by an arrangement for counting the number of photons detected by the detector, means (802) under a scanning movement for comparing the counted number of photons with a pre-set value, and means (803) for controlling the speed of detector displacement with respect to a result obtained from the density of an object to examined under said scanning movement.
A computer useable medium having computer readable program code embodied therein to enable controlling exposure in an x-ray apparatus, when imaging an object, the apparatus comprising an x-ray source, a displaceable detector, the computer program code being arranged to control displacement of said detector array with a controllable speed across an image exposure area, the computer program code comprising:
- an instruction set for acquiring a signal relating to photons incident on at least a part of the detector under a scanning movement, an instruction set for comparing said acquired signal with a target value, and instruction set for controlling the speed of detector displacement with respect to the result of the comparison under said scanning movement.
A computer useable medium having computer readable program code embodied therein to enable controlling exposure in an x-ray apparatus, for imagining an object, the apparatus comprising an x-ray source and a displaceable detector being arranged to move with a controllable speed across an image exposure area, said code comprising:
- a first instruction set for acquiring a signal relating to photons incident on at least a part of the detector under a scanning movement, a second instruction set for comparing said acquired signal with a target value, and a third instruction set for controlling the speed of detector displacement with respect to the result of the comparison under said scanning movement.
A computer program for controlling exposure in an x-ray apparatus, when imaging an object, the apparatus comprising an x-ray source, a displaceable detector, the computer program being arranged to control displacement of said detector array with a controllable speed across an image exposure area, the computer program comprising:
- an instruction set for acquiring a signal relating to photons incident on at least a part of the detector under said scanning movement, an instruction set for comparing said acquired signal with a target value, and instruction set for controlling the speed of detector displacement with respect to the result of the comparison under said scanning movement.
A computer program for controlling exposure in an x-ray apparatus, for imagining an object, the apparatus comprising an x-ray source and a displaceable detector being arranged to move with a controllable speed across an image exposure area, said program comprising:
- a first instruction set for acquiring a signal relating to photons incident on at least a part of the detector under a scanning movement,
- a second instruction set for comparing said acquired signal with a target value, and
- a third instruction set for controlling the speed of detector displacement with respect to the result of the comparison under said scanning movement.
Dependencies are inferred from the claim text.