An apparatus for determining an orientation of a patient's chest, the apparatus comprising: - an input unit; and - a processing unit; wherein, the input unit is configured to receive an image of a patient, the image comprising image data of the patient's chest, the image being a lateral chest X-ray radiograph or an image acquired with a depth camera; wherein, the input unit is configured to receive an X-ray radiograph of the patient's chest acquired by an X-ray imaging unit with an X-ray imaging axis extending from an X-ray source to an X-ray detector; wherein, the input unit is configured to provide the image and the X-ray radiograph to the processing unit; wherein, the processing unit is configured to determine an orientation of the patient's chest in the X-ray radiograph with respect to the X-ray imaging axis, the determination comprising utilization of the image and the X-ray radiograph; and wherein the processing unit is configured to determine information relating to a clavicle to spinous process distance of the patient, the determination comprising utilization of the image, and wherein determination of the orientation of the patient's chest in the X-ray radiograph with respect to the X-ray imaging axis comprises utilization of the information relating to the clavicle to spinal process distance of the patient. - an input unit; and - a processing unit; wherein, the input unit is configured to receive an image of a patient, the image comprising image data of the patient's chest, the image being a lateral chest X-ray radiograph or an image acquired with a depth camera; wherein, the input unit is configured to receive an X-ray radiograph of the patient's chest acquired by an X-ray imaging unit with an X-ray imaging axis extending from an X-ray source to an X-ray detector; wherein, the input unit is configured to provide the image and the X-ray radiograph to the processing unit; wherein, the processing unit is configured to determine an orientation of the patient's chest in the X-ray radiograph with respect to the X-ray imaging axis, the determination comprising utilization of the image and the X-ray radiograph; and wherein the processing unit is configured to determine information relating to a clavicle to spinous process distance of the patient, the determination comprising utilization of the image, and wherein determination of the orientation of the patient's chest in the X-ray radiograph with respect to the X-ray imaging axis comprises utilization of the information relating to the clavicle to spinal process distance of the patient. wherein, the input unit is configured to receive an image of a patient, the image comprising image data of the patient's chest, the image being a lateral chest X-ray radiograph or an image acquired with a depth camera; wherein, the input unit is configured to receive an X-ray radiograph of the patient's chest acquired by an X-ray imaging unit with an X-ray imaging axis extending from an X-ray source to an X-ray detector; wherein, the input unit is configured to provide the image and the X-ray radiograph to the processing unit; wherein, the processing unit is configured to determine an orientation of the patient's chest in the X-ray radiograph with respect to the X-ray imaging axis, the determination comprising utilization of the image and the X-ray radiograph; and wherein the processing unit is configured to determine information relating to a clavicle to spinous process distance of the patient, the determination comprising utilization of the image, and wherein determination of the orientation of the patient's chest in the X-ray radiograph with respect to the X-ray imaging axis comprises utilization of the information relating to the clavicle to spinal process distance of the patient.