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Asense comments and Slices #138

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Nov 9, 2024
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Asense comments and Slices #138

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21 changes: 11 additions & 10 deletions src/system/Asense.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -19,7 +19,7 @@ and coil sensitivity maps `smaps`.

The input `smaps` can either be a `D+1` dimensional array
of size `(size(samp)..., ncoil)`,
or a Vector of `ncoil` arrays of size `size(samp)`.
or a Vector (or `Slices`) of `ncoil` arrays of size `size(samp)`.

# Input
- `samp::AbstractArray{<:Bool}` `D`-dimensional sampling pattern.
Expand All @@ -37,7 +37,7 @@ Returns a `LinearMapsAA.LinearMapAO` object.
"""
function Asense(
samp::AbstractArray{<:Bool, D},
smaps::Vector{<:AbstractArray{<:Number}},
smaps::AbstractVector{<:AbstractArray{<:Number}},
;
dims = 1:D,
T::Type{<:Complex{<:AbstractFloat}} = ComplexF32,
Expand All @@ -48,9 +48,9 @@ function Asense(
kwargs...
) where {D, Tw <: Number}

all(in(1:D), dims) || error("dims $dims")
promote_type(Tw, T) == Tw || error("type Tw=$Tw cannot hold T=$T")
axes(work1) == axes(work2) == axes(samp) || error("axes mismatch: samp work")
all(in(1:D), dims) || throw(DimensionMismath("dims $dims"))
promote_type(Tw, T) == Tw || throw("type Tw=$Tw cannot hold T=$T")
axes(work1) == axes(work2) == axes(samp) || throw("axes mismatch: samp work")
all(==(axes(samp)), axes.(smaps)) || throw("axes mismatch: samp smaps")

sdim = size(samp)
Expand All @@ -66,12 +66,12 @@ function Asense(

function forw!(y, x)
for ic in 1:ncoil
@. work1 = x * smaps[ic]
@. work1 = x * smaps[ic] # apply sensitivity map
ifftshift!(work2, work1)
mul!(work2, pf, work2)
mul!(work2, pf, work2) # FFT
fftshift!(work1, work2)
if factor == 1
y[:,ic] .= work1[samp]
y[:,ic] .= work1[samp] # sampling
else
@. y[:,ic] = work1[samp] * factor
end
Expand Down Expand Up @@ -111,13 +111,14 @@ function Asense(
end


# handle typical array version of `smaps` efficiently
function Asense(
samp::AbstractArray{<:Bool, D},
smaps::AbstractArray{<:Number},
;
kwargs...
) where D
ndims(smaps) == D+1 || error("dimension mismatch")
smapv = [eachslice(smaps, dims = D+1)...]
ndims(smaps) == D+1 || throw(DimensionMismatch("$(ndims(smaps)) ≠ $(D+1)"))
smapv = eachslice(smaps, dims = D+1) # Slices
return Asense(samp, smapv; kwargs...)
end
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