A medical apparatus (300, 400, 500) comprising: - a magnetic resonance imaging system for acquiring magnetic resonance data from an imaging zone; - a processor for controlling the medical apparatus; - a memory storing machine executable instructions (350, 352, 354, 356) wherein execution of the instructions causes the processor to: - acquire (100, 200) the magnetic resonance data using a pulse sequence which specifies an echo time greater than 400 μs; - reconstruct (102, 202) a magnetic resonance image using the magnetic resonance data; - generate (104, 204) a thresholded image by thresholding the magnetic resonance image to emphasize bone structures and suppressing tissue structures in the magnetic resonance image; - generate (106, 206) a bone-enhanced image by applying a background removal algorithm to the thresholded image; characterized in that the execution of the instructions causes the processor to further: - register a probabilistic atlas to the bone-enhanced image, wherein after registration the atlas indicates a probability of a voxel in the bone-enhanced image as being bone; - set the voxel in the bone-enhanced image to a predetermined value indicating no bone tissue if the probabilibity is below a predetermined probability. - a magnetic resonance imaging system for acquiring magnetic resonance data from an imaging zone; - a processor for controlling the medical apparatus; - a memory storing machine executable instructions (350, 352, 354, 356) wherein execution of the instructions causes the processor to: - acquire (100, 200) the magnetic resonance data using a pulse sequence which specifies an echo time greater than 400 μs; - reconstruct (102, 202) a magnetic resonance image using the magnetic resonance data; - generate (104, 204) a thresholded image by thresholding the magnetic resonance image to emphasize bone structures and suppressing tissue structures in the magnetic resonance image; - generate (106, 206) a bone-enhanced image by applying a background removal algorithm to the thresholded image; characterized in that the execution of the instructions causes the processor to further: - register a probabilistic atlas to the bone-enhanced image, wherein after registration the atlas indicates a probability of a voxel in the bone-enhanced image as being bone; - set the voxel in the bone-enhanced image to a predetermined value indicating no bone tissue if the probabilibity is below a predetermined probability. - acquire (100, 200) the magnetic resonance data using a pulse sequence which specifies an echo time greater than 400 μs; - reconstruct (102, 202) a magnetic resonance image using the magnetic resonance data; - generate (104, 204) a thresholded image by thresholding the magnetic resonance image to emphasize bone structures and suppressing tissue structures in the magnetic resonance image; - generate (106, 206) a bone-enhanced image by applying a background removal algorithm to the thresholded image; characterized in that the execution of the instructions causes the processor to further: - register a probabilistic atlas to the bone-enhanced image, wherein after registration the atlas indicates a probability of a voxel in the bone-enhanced image as being bone; - set the voxel in the bone-enhanced image to a predetermined value indicating no bone tissue if the probabilibity is below a predetermined probability. - register a probabilistic atlas to the bone-enhanced image, wherein after registration the atlas indicates a probability of a voxel in the bone-enhanced image as being bone; - set the voxel in the bone-enhanced image to a predetermined value indicating no bone tissue if the probabilibity is below a predetermined probability.