斜めCT
φ ̄ = ( R cos  θ + d sin  θ ) ( − x sin  λ + y cos  λ ) ( R − x cos  λ − y sin  λ ) cos  θ + ( d − z ) sin  θ {\displaystyle {\overline {\varphi }}={\frac {(R\cos \theta +d\sin \theta )(-x\sin \lambda +y\cos \lambda )}{(R-x\cos \lambda -y\sin \lambda )\cos \theta +(d-z)\sin \theta }}} , χ ̄ = R z − d ( x cos  λ + y sin  λ ) ( R − x cos  λ − y sin  λ ) cos  θ + ( d − z ) sin  θ {\displaystyle {\overline {\chi }}={\frac {Rz-d(x\cos \lambda +y\sin \lambda )}{(R-x\cos \lambda -y\sin \lambda )\cos \theta +(d-z)\sin \theta }}} .