def example_cone_3d():
# ------------------ Declare Parameters ------------------
# Volume Parameters:
volume_size = 256
volume_shape = [volume_size, volume_size, volume_size]
v_spacing = 0.25
volume_spacing = [v_spacing, v_spacing, v_spacing]
# Detector Parameters:
detector_shape = [450, 450]
d_spacing = 0.33
detector_spacing = [d_spacing, d_spacing]
# Trajectory Parameters:
number_of_projections = 248
angular_range = np.pi + 2 * np.arctan(detector_shape[0] / 2 / 1200)
source_detector_distance = 1200
source_isocenter_distance = 750
# create Geometry class
geometry = GeometryCone3D(volume_shape, volume_spacing, detector_shape,
detector_spacing, number_of_projections,
angular_range, source_detector_distance,
source_isocenter_distance)
geometry.angular_range = np.radians(200)
projection_geometry = circular_trajectory.circular_trajectory_3d(geometry)
geometry.set_projection_matrices(projection_geometry)
# Get Phantom 3d
phantom = shepp_logan.shepp_logan_3d(volume_shape)
config = tf.ConfigProto()
config.gpu_options.per_process_gpu_memory_fraction = 0.5
config.gpu_options.allow_growth = True
# ------------------ Call Layers ------------------
with tf.Session(config=config) as sess:
sinogram = generate_sinogram.generate_sinogram(phantom,
cone_projection3d,
geometry)
model = nn_model(geometry)
sess.run(tf.global_variables_initializer())
sess.run(tf.local_variables_initializer())
reco_tf, redundancy_weighted_sino_tf = model.model(sinogram)
reco, redundancy_weighted_sino = sess.run(
[reco_tf, redundancy_weighted_sino_tf])
plt.figure()
plt.imshow(reco[(int)(volume_shape[0] / 2), :, :],
cmap=plt.get_cmap('gist_gray'),
vmin=0,
vmax=0.4)
plt.axis('off')
plt.savefig('fdk_reco.png',
dpi=150,
transparent=False,
bbox_inches='tight')
def example_cone_3d():
# ------------------ Declare Parameters ------------------
# Volume Parameters:
volume_size = 256
volume_shape = [volume_size, volume_size, volume_size]
v_spacing = 0.25
volume_spacing = [v_spacing, v_spacing, v_spacing]
# Detector Parameters:
detector_shape = [450, 450]
d_spacing = 0.33
detector_spacing = [d_spacing, d_spacing]
# Trajectory Parameters:
number_of_projections = 248
angular_range = np.pi + 2 * np.arctan(detector_shape[0] / 2 / 1200)
source_detector_distance = 1200
source_isocenter_distance = 750
# create Geometry class
geometry = GeometryCone3D(volume_shape, volume_spacing, detector_shape,
detector_spacing, number_of_projections,
angular_range, source_detector_distance,
source_isocenter_distance)
geometry.angular_range = np.radians(200)
projection_geometry = circular_trajectory.circular_trajectory_3d(geometry)
geometry.set_trajectory(projection_geometry)
# Get Phantom 3d
phantom = shepp_logan.shepp_logan_3d(volume_shape)
phantom = np.expand_dims(phantom, axis=0)
# gpus = tf.config.experimental.list_physical_devices('GPU')
# if gpus:
# try:
# for gpu in gpus:
# tf.config.experimental.set_memory_growth(gpu, True)
# except RunetimeError as e:
# print(e)
# ------------------ Call Layers ------------------
sinogram = generate_sinogram.generate_sinogram(phantom, cone_projection3d,
geometry)
model = nn_model(geometry)
reco, redundancy_weighted_sino = model.model(sinogram)
plt.figure()
plt.imshow(np.squeeze(reco)[volume_shape[0] // 2],
cmap=plt.get_cmap('gist_gray'),
vmin=0,
vmax=0.4)
plt.axis('off')
plt.savefig('fdk_reco.png',
dpi=150,
transparent=False,
bbox_inches='tight')
def example_cone_3d():
# ------------------ Declare Parameters ------------------
# Volume Parameters:
volume_size = 256
volume_shape = [volume_size, volume_size, volume_size]
volume_spacing = [0.5, 0.5, 0.5]
# Detector Parameters:
detector_shape = [2*volume_size, 2*volume_size]
detector_spacing = [1, 1]
# Trajectory Parameters:
number_of_projections = 360
angular_range = 2 * np.pi
source_detector_distance = 1200
source_isocenter_distance = 750
# create Geometry class
geometry = GeometryCone3D(volume_shape, volume_spacing, detector_shape, detector_spacing, number_of_projections, angular_range, source_detector_distance, source_isocenter_distance)
geometry.set_trajectory(circular_trajectory.circular_trajectory_3d(geometry))
# Get Phantom 3d
phantom = shepp_logan.shepp_logan_3d(volume_shape)
# Add required batch dimension
phantom = np.expand_dims(phantom, axis=0)
# ------------------ Call Layers ------------------
# The following code is the new TF2.0 experimental way to tell
# Tensorflow only to allocate GPU memory needed rather then allocate every GPU memory available.
# This is important for the use of the hardware interpolation projector, otherwise there might be not enough memory left
# to allocate the texture memory on the GPU
gpus = tf.config.experimental.list_physical_devices('GPU')
if gpus:
try:
for gpu in gpus:
tf.config.experimental.set_memory_growth(gpu, True)
except RunetimeError as e:
print(e)
sinogram = cone_projection3d(phantom, geometry)
reco_filter = ram_lak_3D(geometry)
sino_freq = tf.signal.fft(tf.cast(sinogram,dtype=tf.complex64))
sino_filtered_freq = tf.multiply(sino_freq,tf.cast(reco_filter,dtype=tf.complex64))
sinogram_filtered = tf.math.real(tf.signal.ifft(sino_filtered_freq))
reco = cone_backprojection3d(sinogram_filtered, geometry)
plt.figure()
plt.imshow(np.squeeze(reco)[volume_shape[0]//2], cmap=plt.get_cmap('gist_gray'))
plt.axis('off')
plt.savefig('3d_cone_reco.png', dpi=150, transparent=False, bbox_inches='tight')
def example_cone_3d():
# ------------------ Declare Parameters ------------------
# Volume Parameters:
volume_size = 256
volume_shape = [volume_size, volume_size, volume_size]
volume_spacing = [0.5, 0.5, 0.5]
# Detector Parameters:
detector_shape = [2 * volume_size, 2 * volume_size]
detector_spacing = [1, 1]
# Trajectory Parameters:
number_of_projections = 360
angular_range = 2 * np.pi
source_detector_distance = 1200
source_isocenter_distance = 750
# create Geometry class
geometry = GeometryCone3D(volume_shape, volume_spacing, detector_shape,
detector_spacing, number_of_projections,
angular_range, source_detector_distance,
source_isocenter_distance)
geometry.set_projection_matrices(
circular_trajectory.circular_trajectory_3d(geometry))
# Get Phantom 3d
phantom = shepp_logan.shepp_logan_3d(volume_shape)
phantom = np.expand_dims(phantom, axis=0)
config = tf.ConfigProto()
config.gpu_options.per_process_gpu_memory_fraction = 0.5
config.gpu_options.allow_growth = True
# ------------------ Call Layers ------------------
with tf.Session(config=config) as sess:
result = cone_projection3d(phantom, geometry)
sinogram = result.eval()
filter = ram_lak_3D(geometry)
sino_freq = np.fft.fft(sinogram, axis=-1)
filtered_sino_freq = sino_freq * filter
filtered_sino = np.fft.ifft(filtered_sino_freq, axis=-1)
result_back_proj = cone_backprojection3d(filtered_sino, geometry)
reco = result_back_proj.eval()
plt.figure()
plt.imshow(np.squeeze(reco)[volume_shape[0] // 2],
cmap=plt.get_cmap('gist_gray'))
plt.axis('off')
plt.savefig('3d_cone_reco.png',
dpi=150,
transparent=False,
bbox_inches='tight')
def example_parallel_3d():
# ------------------ Declare Parameters ------------------
# Volume Parameters:
volume_size = 256
volume_shape = [volume_size, volume_size, volume_size]
volume_spacing = [1, 1, 1]
# Detector Parameters:
detector_size = 350
detector_shape = [detector_size, detector_size]
detector_spacing = [1, 1]
# Trajectory Parameters:
number_of_projections = 180
angular_range = 1 * np.pi
# create Geometry class
geometry = GeometryParallel3D(volume_shape, volume_spacing, detector_shape,
detector_spacing, number_of_projections,
angular_range)
geometry.set_trajectory(circular_trajectory_3d(geometry))
# Get Phantom
phantom = shepp_logan.shepp_logan_3d(volume_shape)
# ------------------ Call Layers ------------------
with tf.Session() as sess:
#result = parallel_projection3d(phantom, geometry)
result = par_projection3d(phantom, geometry)
sinogram = result.eval()
sinogram = sinogram + np.random.normal(loc=np.mean(np.abs(sinogram)),
scale=np.std(sinogram),
size=sinogram.shape) * 0.02
reco_filter = filters.ram_lak_3D(geometry)
sino_freq = np.fft.fft(sinogram, axis=2)
sino_filtered_freq = np.multiply(sino_freq, reco_filter)
sinogram_filtered = np.fft.ifft(sino_filtered_freq, axis=2)
result_back_proj = par_backprojection3d(sinogram_filtered, geometry)
reco = result_back_proj.eval()
import pyconrad as pyc
pyc.setup_pyconrad()
pyc.imshow(phantom)
pyc.imshow(sinogram)
pyc.imshow(reco)
a = 5
def get_test_data(number_of_samples=1):
data = np.empty((number_of_samples,) + tuple(GEOMETRY.sinogram_shape))
labels = np.empty((number_of_samples,) + tuple(GEOMETRY.volume_shape))
with tf.Session() as sess:
# get shepp logan 2d
if number_of_samples == 1:
labels[0] = shepp_logan.shepp_logan_enhanced(GEOMETRY.volume_shape)
data[0] = generate_sinogram(np.expand_dims(labels[0],axis=0), parallel_projection2d, GEOMETRY)
# every slice of shepp logan 3d with number_of_samples as Z-dimension as own image
else:
labels = shepp_logan.shepp_logan_3d((number_of_samples,) + tuple(GEOMETRY.sinogram_shape))
for i in range(number_of_samples):
data[i] = generate_sinogram_parallel_2d(np.expand_dims(labels[i], axis=0), GEOMETRY)
return data, labels
def example_cone_3d():
# ------------------ Declare Parameters ------------------
# Volume Parameters:
volume_size = 8
volume_shape = [volume_size, volume_size, volume_size]
volume_spacing = [1, 1, 1]
# Detector Parameters:
detector_shape = [12, 12]
detector_spacing = [1,1]
# Trajectory Parameters:
number_of_projections = 12
angular_range = np.pi
source_detector_distance = 1200
source_isocenter_distance = 750
# create Geometry class
geometry = GeometryCone3D(volume_shape, volume_spacing, detector_shape, detector_spacing, number_of_projections, angular_range, source_detector_distance, source_isocenter_distance)
geometry.set_trajectory(circular_trajectory.circular_trajectory_3d(geometry))
# Get Phantom
phantom = shepp_logan.shepp_logan_3d(volume_shape).astype(np.float32)
# Add required batch dimension
phantom = np.expand_dims(phantom, axis=0)
sino = cone_projection3d(phantom,geometry)
@tf.function
def test_func_proj(x):
return cone_projection3d(x,geometry)
@tf.function
def test_func_reco(x):
return cone_backprojection3d(x,geometry)
proj_theoretical, proj_numerical = tf.test.compute_gradient(test_func_proj, [sino])
reco_theoretical, reco_numerical = tf.test.compute_gradient(test_func_reco, [sino])
def example_cone_3d():
# ------------------ Declare Parameters ------------------
# Volume Parameters:
volume_size = 256
volume_shape = [volume_size, volume_size, volume_size]
volume_spacing = [0.5, 0.5, 0.5]
# Detector Parameters:
detector_shape = [2 * volume_size, 2 * volume_size]
detector_spacing = [1, 1]
# Trajectory Parameters:
number_of_projections = 360
angular_range = 2 * np.pi
source_detector_distance = 1200
source_isocenter_distance = 750
# create Geometry class
geometry = GeometryCone3D(volume_shape, volume_spacing, detector_shape,
detector_spacing, number_of_projections,
angular_range, source_detector_distance,
source_isocenter_distance)
geometry.set_projection_matrices(
circular_trajectory.circular_trajectory_3d(geometry))
# Get Phantom 3d
phantom = shepp_logan.shepp_logan_3d(volume_shape)
config = tf.ConfigProto()
config.gpu_options.per_process_gpu_memory_fraction = 0.5
config.gpu_options.allow_growth = True
# ------------------ Call Layers ------------------
with tf.Session(config=config) as sess:
result = cone_projection3d(phantom, geometry)
sinogram = result.eval()
#TODO: Use 3D ramp / ram_lak not 1D
# filtering
filter = ramp(int(geometry.detector_shape[1]))
sino_freq = np.fft.fft(sinogram, axis=2)
filtered_sino_freq = np.zeros_like(sino_freq)
for row in range(int(geometry.detector_shape[0])):
for projection in range(geometry.number_of_projections):
filtered_sino_freq[projection,
row, :] = sino_freq[projection,
row, :] * filter[:]
filtered_sino = np.fft.ifft(filtered_sino_freq, axis=2)
result_back_proj = cone_backprojection3d(filtered_sino, geometry)
reco = result_back_proj.eval()
plt.figure()
plt.imshow(reco[(int)(volume_shape[0] / 2), :, :],
cmap=plt.get_cmap('gist_gray'))
plt.axis('off')
plt.savefig('3d_cone_reco.png',
dpi=150,
transparent=False,
bbox_inches='tight')
