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1. (WO2019063640) A METHOD AND A SYSTEM FOR OBTAINING OPERATING PARAMETERS FOR X RAY DATA ACQUISITION
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WHAT IS CLAIMED IS:

1. A method for obtaining operating parameters for x-ray imaging a patient's maxillofacial region, the method comprising:

-identifying a patient's maxillofacial first region of interest (ROI1),

-determining a height of a horizontal plane of said patient's maxillofacial first region of interest (ROI1) when the patient is in an occlusion position or bites a patient positioning accessory, said horizontal plane passing through the teeth and the bones of the jaw,

-acquiring through a slit-shaped collimator window a first set of data relative to said patient's maxillofacial first region of interest (ROI1) including the horizontal plane using x-ray CBCT imaging and a first x-ray dose , said first set of data being suitable for generating a CBCT slice,

-reconstructing the CBCT slice comprising the horizontal plane based on the first set of data relative to the patient's maxillofacial first region of interest (ROI1),

-obtaining operating parameters for an x-ray imaging apparatus based on the reconstructed CBCT slice in view of acquiring a second set of data of a patient's maxillofacial second region of interest (ROI2) using a second x-ray dose, the first x-ray dose being lower than the second x-ray dose.

2. The method of claim 1 , wherein determining a height of the horizontal plane of the patient comprises beforehand one of the following:

- acquiring a lateral x-ray scout view comprising the patient's maxillofacial first region of interest (ROI1);

-acquiring an optical image comprising the patient's maxillofacial first region of interest (ROI1) including landmarks;

-performing physical measurements on the patient's maxillofacial first region of interest (ROI1) using a patient positioning device.

3. The method of claim 1 or 2, wherein it comprises determining features relative to the patient's maxillofacial first region morphology or to the x-ray patient attenuation in the patient's maxillofacial first region based on the reconstructed CBCT slice , the obtaining of operating parameters being based on the determined features.

4. The method of claim 3, wherein the determined features relative to the patient's maxillofacial first region morphology include at least one of the width , depth and shape of the dental arch of the patient's maxillofacial first region.

5. The method of claim 4, wherein the width of the dental arch of the patient's maxillofacial first region is determined by determining the width between the two ends of the patient's mandibular rami.

6. The method of any of claims 3 to 5, wherein the determined features relative to the patient's maxillofacial first region morphology include the relative position of the teeth with respect to the dental arch.

7. The method of any of claims 4 to 6, wherein the patient's morphology is determined based on both the width of the maxillofacial first region and the comparison of this width with a predetermined model of different patient's morphologies or predetermined different patient's morphology characteristics.

8. The method of claim 7, wherein the patient's morphology is

also determined based on the depth of the patient's mandibular rami relative to the position of the incisors.

9. The method of claim 7 or 8, wherein the predetermined different patient's

morphology characteristics include a predetermined set of dental arch shapes including a U shape, a V shape and a square shape.

lO.The method of any of claims 1 to 9, wherein obtaining operating parameters for an x-ray imaging apparatus that comprises an x-ray source and at least one x-ray sensor based on the reconstructed CBCT slice includes adjusting a trajectory for both ray source and x-ray sensor based on morphological data.

1 l .The method of any of claims 1 to 10, wherein obtaining operating parameters for an x-ray imaging apparatus that comprises an x-ray source and at least one x-ray sensor based on the reconstructed CBCT slice includes adjusting the x-ray dose for the x-ray source based on morphological data.

12. The method of any of claims 1 to 1 1, wherein obtaining operating parameters for an x-ray imaging apparatus that comprises an x-ray source and at least one x-ray sensor based on the reconstructed CBCT slice includes adjusting the x-ray dose for the x-ray source based on a measurement of the x-ray attenuation by the patient's maxillofacial first region bone density on the reconstructed CBCT slice.

13.The method of any of claims 1 to 12, wherein obtaining operating parameters for an x-ray imaging apparatus includes one of the following:

-selecting a predetermined set of operating parameters;

-determining operating parameters based on a predetermined model.

14. The method of any of claims 1 to 13, wherein the first x-ray dose does not exceed 20% of the second x-ray dose.

15.A system for obtaining operating parameters for x-ray imaging a patient's maxillofacial region, comprising:

- an x-ray source and at least one x-ray sensor that are configured to move around a patient's maxillofacial first region of interest while irradiating the latter with a slit-shaped x-ray beam formed from a first x-ray dose so as to acquire a first set of data-relative to said patient's maxillofacial first region of interest when the patient is in an occlusion position or bites a patient positioning accessory, said patient's maxillofacial first region of interest including a horizontal plane that passes through the teeth and the bones of the jaw, said first set of data being suitable for generating a CBCT slice, -a microprocessor configured to:

reconstruct the CBCT slice comprising the horizontal plane based on the first set of data relative to the patient's maxillofacial first region of interest,

obtain operating parameters for an x-ray imaging apparatus based on the reconstructed CBCT slice in view of acquiring a second set of data of a patient's maxillofacial second region using a second x-ray dose, the first x-ray dose being lower than the second x-ray dose.

16.A computer storage medium having instructions stored therein for causing a computer or a microprocessor to perform the method of any of claims 1 to 14.