%0 Journal Article %1 0031-9155-21-3-004 %A Brooks, R A %A Chiro, G Di %D 1976 %J Physics in Medicine and Biology %K tomography %N 3 %P 390 %T Beam hardening in X-ray reconstructive tomography %U http://stacks.iop.org/0031-9155/21/i=3/a=004 %V 21 %X As a polychromatic X-ray beam passes through matter, low energy photons are preferentially absorbed, and the (logarithmic) attenuation is no longer a linear function of absorber thickness. This leads to various artifacts in reconstructive tomography. If a water bag is used, the nonlinear attenuation in bone causes a distortion of the bone values and a spill-over inside the skull, or 'pseudo-cortex' artifact. If no water bag is used, there is an additional effect due to the varying thickness of soft tissue which causes a depression of interior values, or 'cupping'. Both artifacts can be remedied by additional prefiltering of the beam and by applying a linearization correction to the detector outputs. These effects have been studied by computer simulation.

@article{0031-9155-21-3-004, abstract = {As a polychromatic X-ray beam passes through matter, low energy photons are preferentially absorbed, and the (logarithmic) attenuation is no longer a linear function of absorber thickness. This leads to various artifacts in reconstructive tomography. If a water bag is used, the nonlinear attenuation in bone causes a distortion of the bone values and a spill-over inside the skull, or 'pseudo-cortex' artifact. If no water bag is used, there is an additional effect due to the varying thickness of soft tissue which causes a depression of interior values, or 'cupping'. Both artifacts can be remedied by additional prefiltering of the beam and by applying a linearization correction to the detector outputs. These effects have been studied by computer simulation.}, added-at = {2016-07-27T15:00:35.000+0200}, author = {Brooks, R A and Chiro, G Di}, biburl = {https://www.bibsonomy.org/bibtex/225d7f4fc5d1bbbea37a14625541e2385/alex_ruff}, description = {Beam hardening in X-ray reconstructive tomography - IOPscience}, interhash = {2937853661a40705b47ba0983f1e1f59}, intrahash = {25d7f4fc5d1bbbea37a14625541e2385}, journal = {Physics in Medicine and Biology}, keywords = {tomography}, number = 3, pages = 390, timestamp = {2016-07-27T15:00:35.000+0200}, title = {Beam hardening in X-ray reconstructive tomography}, url = {http://stacks.iop.org/0031-9155/21/i=3/a=004}, volume = 21, year = 1976 }