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ReSiDe_M_mrxcat_inference.py
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ReSiDe_M_mrxcat_inference.py
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# -*- coding: utf-8 -*-
"""
Created on Thu Oct 12 01:18:41 2023
@author: sizhu
"""
import sys
# sys.path.append('./')
import logging
import random
import os
import h5py
import numpy as np
import torch
import torchvision
from torch.nn import functional as F
from torch.utils.data import DataLoader
from scipy.io import loadmat, savemat
import torch.nn as nn
import torch
import torch.nn.init as init
from pMRI_Op_2D_t import pMRI_Op_2D_t
from torch.utils.data import DataLoader
from torch.optim.lr_scheduler import MultiStepLR
import os, glob, re
import torch.optim as optim
from skimage.restoration import (denoise_wavelet, estimate_sigma)
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)
def NMSE(true,b):
y = 20*np.log10(np.linalg.norm(true-b)/np.linalg.norm(true))
return y
class MeanOnlyBatchNorm(nn.Module):
def __init__(self, num_features, momentum=0.1):
super(MeanOnlyBatchNorm, self).__init__()
self.num_features = num_features
self.momentum = momentum
self.bias = nn.Parameter(torch.zeros(num_features))
# self.running_mean = torch.zeros(num_features)
self.register_buffer('running_mean', torch.zeros(num_features))
def forward(self, inp):
size = list(inp.size())
beta = self.bias.view(1, self.num_features, 1, 1, 1)
if self.training:
avg = torch.mean(inp, dim=4)
avg = torch.mean(avg, dim=3)
avg = torch.mean(avg, dim=2)
avg = torch.mean(avg, dim=0)
self.running_mean = (1 - self.momentum) * self.running_mean + self.momentum * avg
else:
avg = self.running_mean.repeat(size[0], 1)
output = inp - avg.view(1, self.num_features, 1, 1, 1)
output = output + beta
return output
def extra_repr(self):
return '{num_features}, momentum={momentum} '.format(**self.__dict__)
class BasicNet(nn.Module):
def __init__(self):
layers = []
imchannel = 2
filternum = 128
filtersize = 3
depth = 3
super(BasicNet, self).__init__()
layers.append(nn.utils.spectral_norm(nn.Conv3d(imchannel, filternum, filtersize, padding=1, bias=True), n_power_iterations=20))
layers.append(nn.ReLU(inplace=True))
for _ in range(depth):
layers.append(nn.utils.spectral_norm(nn.Conv3d(filternum, filternum, filtersize, padding=1, bias=False), n_power_iterations=20))
layers.append(MeanOnlyBatchNorm(filternum,momentum=0.95))
layers.append(nn.ReLU(inplace=True))
layers.append(nn.utils.spectral_norm(nn.Conv3d(filternum, imchannel, filtersize, padding=1, bias=False), n_power_iterations=20))
self.cnn = nn.Sequential(*layers)
self.init_weights()
def forward(self,x):
y = x
out = self.cnn(x)
return y-out
def init_weights(self):
for m in self.modules():
if isinstance(m, nn.Conv3d):
init.xavier_normal_(m.weight)
if m.bias is not None:
init.constant_(m.bias, 0)
def downsample_data(data, patterns):
if np.ndim(patterns)==3:
mask_pattern = {}
y = []
for i in range(0,np.size(patterns,2)):
mask_pattern[i] = np.where(patterns[:,:,i].T.flatten()>0)
for j in range(0,np.size(data,2)):
tmp = data[:,:,j,i].T.flatten()
tmp = tmp[mask_pattern[i]]
y = np.append(y,tmp)
elif np.ndim(patterns)==4:
data = data*np.transpose(np.expand_dims(patterns,axis=4),(0,1,2,4,3))
y = data[abs(data)>0]
return y
def powerite(pMRI, n):
q = np.random.randn(*n)
q = q/np.linalg.norm(q.flatten())
th = 1e-3
err = np.inf
uest = np.inf
while err > th:
q = pMRI.multTr(pMRI.mult(q))
unew = np.linalg.norm(q.flatten())
err = abs(np.log(uest/unew))
uest = unew
q = q/np.linalg.norm(q.flatten())
return uest
# if __name__ == '__main__':
device = torch.device('cuda:0')
samp = np.float32(loadmat(os.getcwd()+'/Perfusion/MRXCAT/data/perf_phantom_samp_R4.mat')['samp'])
samp_shifted = np.fft.fftshift(np.fft.fftshift(samp,axes = 0), axes = 1)
rho = 1
nite = 80
for i in range(17,22):
savenmse = []
kdata = loadmat(os.getcwd()+'/Perfusion/MRXCAT/data/perf_phantom_'+str(i)+'_k.mat')['k_full']
lsq = loadmat(os.getcwd()+'/Perfusion/MRXCAT/data/perf_phantom_'+str(i)+'_imtrue.mat')['imtrue']
S = np.squeeze(loadmat(os.getcwd()+'/Perfusion/MRXCAT/data/perf_phantom_'+str(i)+'_map_R4.mat')['map'])
x0 = loadmat(os.getcwd()+'/Perfusion/MRXCAT/data/perf_phantom_'+str(i)+'_x0_R4.mat')['x0']
x0 = np.fft.fftshift(np.fft.fftshift(x0,axes = 0), axes = 1)
x0 = np.tile(np.expand_dims(x0,axis=2),[1,1,np.size(samp_shifted,2)])
kdata = kdata*np.expand_dims(samp,axis=2)
S = np.tile(np.expand_dims(S,axis = 3),[1,1,1,np.size(samp,2)])
kdata = np.fft.fftshift(np.fft.fftshift(kdata,axes = 0), axes = 1)
S = np.fft.fftshift(np.fft.fftshift(S,axes = 0), axes = 1)
k_avg = kdata.sum(axis = 3)/samp_shifted.sum(axis = 2,keepdims=1)
kdata = downsample_data(kdata,samp_shifted)
pMRI = pMRI_Op_2D_t(S, samp_shifted)
x = x0
z = pMRI.mult(x)-kdata
w = np.fft.fftshift(np.fft.fftshift(x,axes=0),axes = 1)
p = powerite(pMRI,x.shape)
gamma = rho*p
for ite in range(nite):
model = BasicNet()
model = torch.load(os.getcwd()+'/Perfusion/MRXCAT/data/pymodel_%03d.pth' % (ite+1))
model = model.to(device)
model.eval()
xold = x
midvar = xold-rho*pMRI.multTr(z)
midvar = np.fft.ifftshift(np.fft.ifftshift(midvar,axes=1),axes = 0)
midvar_norm = np.expand_dims(np.expand_dims(midvar/np.abs(np.real(midvar)).max(),axis = 0),axis = 1)
midvar_im = torch.from_numpy(np.array(np.concatenate((np.real(midvar_norm),np.imag(midvar_norm)),1),dtype = 'float32')).cuda()
midout = model(midvar_im).cpu().detach().numpy().astype(np.float32)
midout = np.squeeze(midout[:,0,:,:,:]+1j*midout[:,1,:,:,:])
w = midout* np.abs(np.real(midvar)).max()
x = np.fft.fftshift(np.fft.fftshift(w,axes=0),axes = 1)
s = 2*x-xold
z = gamma_p/(1+gamma_p)*z+1/(1+gamma_p)*(pMRI.mult(s)-kdata)
nmse_i = NMSE(lsq,w)
savenmse.append(nmse_i)
print('normalized mean square error of x'+str(i)+': ' + repr(nmse_i))
file_name = os.getcwd()+'/Perfusion/MRXCAT/data/reside_m_k'+str(i)+'_auto/im_'+str(ite)+'.mat'
savemat(file_name,{'x':w})
savemat(os.getcwd()+'/Perfusion/MRXCAT/data/reside_m_k'+str(i)+'_auto/nmse.mat',{'nmse':savenmse})