Replace cone with fan which is more correct

roflmaostc · Feb 7, 2024 · 0c5cc8b · 0c5cc8b · roflmaostc · Feb 7, 2024
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diff --git a/README.md b/README.md
@@ -14,7 +14,7 @@ A simple yet sufficiently fast Radon and inverse Radon (iradon) transform implem
 * [x] For 2D and 3D arrays 
 * [x] parallel `radon` and `iradon` (`?RadonParallelCircle`)
 * [x] attenuated `radon` and `iradon` (see the parameter `μ`) and see this [paper](https://iopscience.iop.org/article/10.1088/0266-5611/17/1/309/meta) as reference)
-* [x] arbitrary 2D geometries where starting and endpoint of each ray can be specified (cone beam could be a special case if this) (`?RadonFlexibleCircle`)
+* [x] arbitrary 2D geometries where starting and endpoint of each ray can be specified (fan beam could be a special case if this) (`?RadonFlexibleCircle`)
 * [x] based on [KernelAbstractions.jl](https://github.com/JuliaGPU/KernelAbstractions.jl)
 * [x] tested on `CPU()` and `CUDABackend()`
 * [x] registered adjoint rules for both `radon` and `iradon`

diff --git a/docs/src/geometries.md b/docs/src/geometries.md
@@ -50,13 +50,13 @@ This interface has a simple API but is quite powerful.
 The first range indicates the position upon entrance in the circle.
 The second range indicates the position upon exit of the circle.
 
-### Cone Beam
+### fan Beam
 ```julia
-geometry_cone = RadonFlexibleCircle(N, -(N-1)÷2:(N-1)÷2, range(-(N-1)÷4, (N-1)÷4, N-1))
+geometry_fan = RadonFlexibleCircle(N, -(N-1)÷2:(N-1)÷2, range(-(N-1)÷4, (N-1)÷4, N-1))
 
-projected_cone = iradon(sinogram, angles; geometry=geometry_cone);
+projected_fan = iradon(sinogram, angles; geometry=geometry_fan);
 
-simshow(projected_cone, γ=0.01)
+simshow(projected_fan, γ=0.01)
 ```
 ![](../assets/parallel_geometry_cone.png)
 

diff --git a/docs/src/index.md b/docs/src/index.md
@@ -13,7 +13,7 @@ A simple yet sufficiently fast Radon and inverse Radon (iradon) transform implem
 * [x] For 2D and 3D arrays 
 * [x] parallel `radon` and `iradon` (`?RadonParallelCircle`)
 * [x] attenuated `radon` and `iradon` (see the parameter `μ`)
-* [x] arbitrary 2D geometries where starting and endpoint of each ray can be specified (cone beam could be a special case if this) (`?RadonFlexibleCircle`)
+* [x] arbitrary 2D geometries where starting and endpoint of each ray can be specified (fan beam could be a special case if this) (`?RadonFlexibleCircle`)
 * [x] It is restricted to the incircle of radius `N ÷ 2 - 1` if the array has size `(N, N, N_z)`
 * [x] based on [KernelAbstractions.jl](https://github.com/JuliaGPU/KernelAbstractions.jl)
 * [x] tested on `CPU()` and `CUDABackend`

diff --git a/examples/1_documentation_different_geometries.jl b/examples/1_documentation_different_geometries.jl
@@ -62,22 +62,22 @@ projection_small = iradon(sinogram_small, angles; geometry=geometry_small);
 simshow(projection_small)
 
 # ╔═╡ da663a25-6dcd-4664-9bd1-c84970e58346
-md"# Similar to Cone Beam Tomography"
+md"# Similar to fan Beam Tomography"
 
 # ╔═╡ 65d32c65-6e1f-417b-aba3-3c34dac35e05
-geometry_cone = RadonFlexibleCircle(N, -(N-1)÷2:(N-1)÷2, range(-(N-1)÷4, (N-1)÷4, N-1))
+geometry_fan = RadonFlexibleCircle(N, -(N-1)÷2:(N-1)÷2, range(-(N-1)÷4, (N-1)÷4, N-1))
 
 # ╔═╡ 26036d0c-2d5e-436c-8343-c4cd66c362c6
 N-100
 
 # ╔═╡ 37d760fa-74e6-47d1-b8e6-3315c1747b4c
-projected_cone = iradon(sinogram, angles; geometry=geometry_cone);
+projected_fan = iradon(sinogram, angles; geometry=geometry_fan);
 
 # ╔═╡ 878121c5-4ad5-477b-88c7-f53df7510052
-simshow(projected_cone, γ=0.01)
+simshow(projected_fan, γ=0.01)
 
 # ╔═╡ afe43c8c-cb98-411b-af8f-1228983ee2e0
-md"# Extreme Cone Beam Tomography"
+md"# Extreme fan Beam Tomography"
 
 # ╔═╡ 7b0c8263-50d0-4569-96cb-297b4746ece3
 geometry_extreme = RadonFlexibleCircle(N, -(N-1)÷2:(N-1)÷2, zeros((199,)))

diff --git a/src/geometry.jl b/src/geometry.jl
@@ -36,7 +36,7 @@ with respect to the midpoint which is located at `N ÷ 2 + 1`.
 
 One definition could be: `RadonFlexibleCircle(10, -4:4, zeros((9,)))`
 It would describe rays which enter the circle at positions `-4:4` but all of them would focus at the position 0 when leaving the circle.
-This is an extreme form of cone beam tomography.
+This is an extreme form of fan beam tomography.
 """
 struct RadonFlexibleCircle{T, T2} <: RadonGeometry
     N::Int