def process(img_mtx, dataset):
img_mtx = apply_modality_lut(img_mtx, dataset)
p1, p99 = np.percentile(img_mtx, (1, 99))
img_mtx[img_mtx < p1] = p1
img_mtx[img_mtx > p99] = p99
img_mtx = (img_mtx - p1) / (p99 - p1)
return img_mtx
def get_image(self, group, i, slices, clear_cache=True):
x = torch.zeros(slices, 512, 512, dtype=torch.uint8) # (C, H, W)
rows = self.get_slices(group, i, slices)
#sop_uids = np.empty([slices], dtype=np.dtype('U12'))
sop_uids = []
for j, (idx, row) in enumerate(rows.iterrows()):
if row.SOPInstanceUID not in self.cache:
p = test_dir / 'test' / row.StudyInstanceUID / row.SeriesInstanceUID / f'{row.SOPInstanceUID}.dcm'
dcm = pydicom.dcmread(str(p))
a = apply_modality_lut(dcm.pixel_array, dcm).astype(
np.float32) # TODO: to float32 if memory runs out?
t = torch.from_numpy(a)
if t.shape != (384, 384):
t = t.view(1, 1, *t.shape) # HW -> BCHW
t = torch.nn.functional.interpolate(
t, size=512,
mode='nearest') # resize (FloatTensors only!)
t = t.view(t.shape[-2:]) # BCHW -> HW
ww, wc = h.window
w0, w1 = wc - ww / 2, wc + ww / 2
t = torch.clamp(t, w0, w1) # window
t = (t - w0) * 255. / ww # normalize
self.cache[row.SOPInstanceUID] = t.to(torch.uint8)
x[j] = self.cache[row.SOPInstanceUID]
#sop_uids[j] = row.SOPInstanceUID
sop_uids.append(row.SOPInstanceUID)
if clear_cache:
self.cache = {}
return x, sop_uids
def read_dcm(path):
dcm = pydicom.read_file(path)
img = apply_voi_lut(apply_modality_lut(dcm.pixel_array, dcm), dcm)
img = ((img - img.min()) / (img.max() - img.min()) * 255).astype(np.uint8)
img = np.invert(img)
if len(img.shape) < 3:
img = np.repeat(img[..., None], 3, axis=-1)
return img
def read_dicom_image(self, img_name, invert):
dcm = pydicom.read_file(img_name)
img = apply_voi_lut(apply_modality_lut(dcm.pixel_array, dcm), dcm)
img = ((img - img.min()) / (img.max() - img.min()) * 255).astype(
np.uint8)
if invert != None:
img = np.invert(img)
img = np.expand_dims(img, axis=-1)
return img
def dcm2png(path):
dcm = pydicom.read_file(path)
# extracting image (pixels data)
img = apply_voi_lut(apply_modality_lut(dcm.pixel_array, dcm), dcm)
if not (("PhotometricInterpretation" in dcm) and
(dcm.PhotometricInterpretation == 'MONOCHROME2')):
img = np.invert(img)
img -= img.min()
img = img / img.max()
img = (img * 255)
img = img.astype(np.uint8)
path = str(path) + '.png'
plt.imsave(path, img)
return path
def __getitem__(self, index):
path_to_folder = os.path.join(self.root_dir, self.case_ids[index])
files = []
for r, d, f in os.walk(path_to_folder):
for file in f:
if '.dcm' in file:
files.append(os.path.join(r, file))
ct_scan = np.zeros(shape=(512, 512, len(files)))
for file in files:
dataset = pydicom.dcmread(file)
pixel_array = dataset.pixel_array
hu = apply_modality_lut(pixel_array, dataset)
ct_scan[:, :, dataset.InstanceNumber - 1] = hu
ct_scan = torch.from_numpy(ct_scan).float()
# Resize to 224 by 224 and only take 1 out of 5 elements on the Z axis into account
ct_scan = F.interpolate(ct_scan[None, None, ...],
size=(224, 224, ct_scan.shape[-1] // 5),
align_corners=True,
mode='trilinear')
ct_scan = ct_scan.squeeze(0).squeeze(0)
torch.clamp(ct_scan, min=-500, max=1500, out=ct_scan)
ct_scan = ct_scan[None, ...]
if self.stage == 'train' and self.args.data_augment:
# Default randomly mirroring the second and third axes
ct_scan, _ = spatial_transforms.augment_mirroring(ct_scan,
axes=(1, 2))
ct_scan = ct_scan[0]
######################################################
# Preprocessing for both train and validation data #
######################################################
# data should be a numpy array with shape [x, y, z] or [c, x, y, z]
full_channel = np.stack([ct_scan, ct_scan, ct_scan])
full_channel = (full_channel - full_channel.min()) / (
full_channel.max() - full_channel.min())
if self.stage == 'train' and self.args.data_augment:
full_channel = self.do_augmentation(full_channel)
label = self.mapping[self.labels[index]]
full_channel = np.transpose(full_channel, axes=(3, 0, 1, 2))
full_channel = torch.from_numpy(full_channel).float()
return full_channel, label, self.case_ids[index]
def get_grayscale_from_FileDataset(dicomfile):
"""
Function converts pixel array of dicom file to grayscale and returns is.
Before conversion Modality LUT operation is applied.
:param dicomfile: object pydicom.dataset.FileDataset
:return: numpy array in grayscale
"""
# Get pixel array
image = dicomfile.pixel_array
# Apply Modality LUT or Rescale Operation
hu = apply_modality_lut(image, dicomfile)
# Apply conversion to grayscale
image_gray = convert_array_to_grayscale(hu)
return image_gray
def __init__(self, folder_name):
'''
Reads in the dcm files in a folder which corresponds to a patient.
It follows carefully the physical slice locations and the frames in a hearth cycle.
It does not matter if the location is getting higher or lower.
'''
self.images_unordered = list(
) # contains the images and additional data_processing
dcm_files = os.listdir(folder_name)
for dcm_fl in dcm_files:
# ignore if not a dcm file
if not dcm_fl.endswith('.dcm'):
continue
# read the image
path = os.path.join(folder_name, dcm_fl)
try:
dcm = dicom.dcmread(path, force=True)
except InvalidDicomError:
logger.error("Invalid dicom {}".format(path))
continue # if no valid dcm continue with the next file
# access the required fields
try:
_, _, pos_z = self.__get_dcmdata(dcm, "ImagePositionPatient")
timestamp = self.__get_dcmdata(dcm, "ContentTime")
image_pixels = dcm.pixel_array # to get a numpy array
except AttributeError as ex:
logger.error(
"Accessing elements in dcm file {} yielded: {}".format(
path, ex))
continue
# modality transformation on pixels (mainly for Philips)
image = apply_modality_lut(image_pixels, dcm)
# sequence is ordered according to ImagePatientPosition
data = (pos_z, timestamp, image)
self.images_unordered.append(data)
# ordering the images
_images_ = sorted(self.images_unordered,
key=lambda data: data[0]) # apex to base
_images_ = self.__group_frames(_images_)
self.__order_frames(_images_)
# create the image dictionary
self.images = list()
for group in _images_:
img_in_slice = []
for data in group:
img_in_slice.append(data[2])
self.images.append(img_in_slice)
def get_array_dicom_lut(file, folder):
"""
Function reads given dicom file and applies LUT modality operation
in order to get pixel values in Hounsfield units.
:param file: name of dicom file
:param folder: source folder of dicom file
:return: array of pixel data
"""
path = Path(folder) / file
# Get dicom file
dicomfile = pydicom.dcmread(path)
# Get pixel array
image = dicomfile.pixel_array
# Apply Modality LUT or Rescale Operation
hu = apply_modality_lut(image, dicomfile)
return hu
def dicom2narray(path, voi_lut = False, fix_monochrome = True):
"""
Converts a DICOM into a NUMPY array and returns this array and
its corresponding dataset.
"""
dicom = pydicom.read_file(path)
# VOI LUT (if available by DICOM device) is used to transform raw DICOM data
# to "human-friendly" view
if voi_lut:
# If the modality is CT (Scanner Image) we have to convert the values of
# the image first with apply_modality
# It uses the values of RescaleSlope and RescaleIntercept to convert the
# values or the attribute LUT Sequence
if dicom.Modality == "CT":
data = apply_modality_lut(dicom.pixel_array, dicom)
data = apply_voi_lut(data, dicom)
else:
data = apply_voi_lut(dicom.pixel_array, dicom)
else:
data = dicom.pixel_array
# depending on this value, X-ray may look inverted - fix that:
if fix_monochrome and dicom.PhotometricInterpretation == "MONOCHROME1":
data = np.amax(data) - data
#If the DICOM are not in one of these two formats, it can bring new problems.
if dicom.PhotometricInterpretation != "MONOCHROME2" and \
dicom.PhotometricInterpretation != "MONOCHROME1":
warnings.warn("PhotometricInterpretation " +
dicom.PhotometricInterpretation + " can cause unexpected behaviors.\n" +
"File concerned : " + path)
data = data - np.min(data)
data = data / np.max(data)
data = (data * 255).astype(np.uint8)
return (data, dicom)
def extract(image_name):
ending = image_name.split('.')[-1]
if (ending == 'dcm'): #dicom ct image
dataset = pydicom.dcmread(image_name)
hu = apply_modality_lut(dataset.pixel_array, dataset)
density = (dataset.RescaleIntercept +
dataset.RescaleSlope * hu) / 1000 + 1
(spacingX, spacingY) = dataset.PixelSpacing
(sizeX, sizeY) = density.shape
dimensions = (spacingX * sizeX, spacingY * sizeY)
return density, dimensions
else: # jpg or png
img = Image.open(image_name).convert('L') #image data
I = np.asarray(img) # image as greyscale
I = I / 255
# rescale values to [0,1]
J = deepcopy(np.flipud(I))
dimensions = (1, 1) # [cm]
return J, dimensions
def check_dicom_lut_windowing(file, folder):
"""
Function applies LUT Modality and VOI Modality functions.
:param file: source dicom filename
:param folder: source folder
:return: numpy array
"""
raise NotImplementedError("Needs to be checked")
path = Path(folder) / file
# Get dicom file
dicomfile = pydicom.dcmread(path)
# Get pixel array
image = dicomfile.pixel_array
# Apply Modality LUT or Rescale Operation
hu = apply_modality_lut(image, dicomfile)
width = dicomfile.WindowWidth
center = dicomfile.WindowCenter
lower_bound = int(center - width / 2)
upper_bound = int(center + width / 2)
array = hu
array = np.where(array < lower_bound, lower_bound, array)
array = np.where(array > upper_bound, upper_bound, array)
return array
def process_image(image, dataset):
preproc = apply_modality_lut(image, dataset)
perc_cut = percentile_cut(preproc)
return rescale(perc_cut)
# Specify the .dcm folder path
folder_path = "stage_1_test_images"
# Specify the output jpg/png/tiff folder path
jpg_path = "JPG_test"
png_path = "PNG_test"
tiff_path = "TIFF_test"
images_path = os.listdir(folder_path)
for n, image in enumerate(images_path):
ds = dicom.dcmread(os.path.join(folder_path, image))
arr = ds.pixel_array
if choose == 1:
image = image.replace('.dcm', '.jpg')
# apply modality
arr = util.apply_modality_lut(arr, ds)
arr = util.apply_voi_lut(arr, ds, index=0)
cv2.imwrite(os.path.join(jpg_path, image), arr)
elif choose == 2:
image = image.replace('.dcm', '.png')
shape = ds.pixel_array.shape
# Convert to float to avoid overflow or underflow losses.
image_2d = ds.pixel_array.astype(float)
# Rescaling grey scale between 0-255
image_2d_scaled = (np.maximum(image_2d,0) / image_2d.max()) * 255.0
# Convert to uint
def get_hounsfield(self):
hu = apply_modality_lut(self.image_data.pixel_array, self.image_data)
return hu
def get_manufacturer_independent_pixel_image2d_array(ds, has_TransferSyntax):
# '1.2.840.10008.1.2.4.90' #
# ds.file_meta.TransferSyntaxUID = '1.2.840.10008.1.2.4.99' # '1.2.840.10008.1.2.1.99'
# has_TransferSyntax = True
# print(f"syntax:{ds.file_meta.TransferSyntaxUID}")
# RLE 1.2.840.10008.1.2.5: US-PAL-8-10x-echo.dcm is automatically handled as uncompressed case
if (has_TransferSyntax and ds.file_meta.TransferSyntaxUID in [
"1.2.840.10008.1.2.4.50", "1.2.840.10008.1.2.4.51",
"1.2.840.10008.1.2.4.57", "1.2.840.10008.1.2.4.70",
"1.2.840.10008.1.2.4.80", "1.2.840.10008.1.2.4.81",
"1.2.840.10008.1.2.4.90", "1.2.840.10008.1.2.4.91"
]):
print("compressed case !!!!!!!!!")
# return None, ds.PixelData
# ref: https://github.com/pydicom/pydicom/blob/master/pydicom/pixel_data_handlers/pillow_handler.py
print(
"try to get compressed dicom's pixel data manually, can not handle by pydicom in pyodide, lack of some pyodide extension"
)
try:
print(f"pixeldata:{len(ds.PixelData)}")
# TODO: only get 1st frame for multiple frame case and will improve later
if getattr(ds, 'NumberOfFrames', 1) > 1:
print("multi frame")
j2k_precision, j2k_sign = None, None
# multiple compressed frames
# working case (50):
# 1. 0002.dcm, some are [-5], [-4], [-6]. 512x512
# 2. color3d_jpeg_baseline , some frames needs [-1] but some do not need. size unknown?
frame_count = 0
for frame in decode_data_sequence(ds.PixelData):
frame_count += 1
# print(f"frame i:{frame_count}, len:{len(frame)}")
# a = frame[0]
# b = frame[1]
# c = frame[len(frame)-2]
# d = frame[len(frame)-1]
# print(f"{a},{b},{c},{d}")
if frame_count == 1:
pixel_data = frame
# im = _decompress_single_frame(
# frame,
# transfer_syntax,
# ds.PhotometricInterpretation
# )
# if 'YBR' in ds.PhotometricInterpretation:
# im.draft('YCbCr', (ds.Rows, ds.Columns))
# pixel_bytes.extend(im.tobytes())
# if not j2k_precision:
# params = get_j2k_parameters(frame)
# j2k_precision = params.setdefault("precision", ds.BitsStored)
# j2k_sign = params.setdefault("is_signed", None)
# TODO: what is the rule of -5/-1? But even not using pixel_data[:-1], pixel_data[:-5], still work
p2 = pixel_data
else:
print("single frame")
# working case but browser can not render :
# - JPGLosslessP14SV1_1s_1f_8b.dcm, DICOM made JPEG Lossless, 1.2.840.10008.1.2.4.70. 1024x768. local mac is able to view.
# - JPEG57-MR-MONO2-12-shoulder.dcm from https://barre.dev/medical/samples/, JPEG Lossless, 1.2.840.10008.1.2.4.57.
# https://products.groupdocs.app/viewer/jpg can be used to view. local mac seeme not able to view (all black)
# - JPEG-lossy.dcm 1.2.840.10008.1.2.4.51 from https://github.com/pydicom/pydicom/blob/master/pydicom/data/test_files/JPEG-lossy.dcm,
# https://products.groupdocs.app/viewer/jpg can be used to view, local mac seems not able to view (all black)
pixel_data = defragment_data(ds.PixelData)
p2 = pixel_data
print(f"pixel_data:{len(pixel_data)}")
# return None, pixel_data
# try:
# fio = BytesIO(ds.PixelData) # pixel_data)
# image = Image.open(fio)
# except Exception as e:
# print(f"pillow error:{e}")
# print('pillow done')
# JPEG57-MR-MONO2-12-shoulder data:718940 -> data:718924
return None, p2
except Exception as e:
print("failed to get compressed data")
raise e
print("incompressed")
print(
"start reading dicom pixel_array, uncompressed case uses apply_modality_lut"
)
try:
arr = ds.pixel_array
except Exception as e:
if has_TransferSyntax == True:
raise e
else:
# http://dicom.nema.org/dicom/2013/output/chtml/part05/chapter_10.html
print(
"read data fail may due to no TransferSyntaxUID, set it as most often used and default ImplicitVRLittleEndian and try read dicom again"
)
ds.file_meta.TransferSyntaxUID = pydicom.uid.ImplicitVRLittleEndian
arr = ds.pixel_array
print(f"read dicom pixel_array ok, shape:{arr.shape}")
image2d = apply_modality_lut(arr, ds)
return image2d, None
def __init__(self, folder_name):
'''
Reads in the dcm files in a folder which corresponds to a patient.
It follows carefully the physical slice locations and the frames in a hearth cycle.
It does not matter if the location is getting higher or lower.
'''
self.num_slices = 0
self.num_frames = 0
self.broken = False
self.pixel_spacing = 0 # UPDATE: pixel spacing
images = []
slice_locations = []
file_paths = []
dcm_files = sorted(os.listdir(folder_name))
dcm_files = [d for d in dcm_files if len(d.split('.')[-2]) < 4]
if len(dcm_files
) == 0: # sometimes the order number is missing at the end
dcm_files = sorted(os.listdir(folder_name))
for file in dcm_files:
if file.find('.dcm') != -1:
try:
temp_ds = dicom.dcmread(os.path.join(folder_name, file))
images.append(
apply_modality_lut(
temp_ds.pixel_array,
temp_ds)) # UPDATE: apply modality lut
slice_locations.append(temp_ds.SliceLocation)
file_paths.append(os.path.join(folder_name, file))
if self.pixel_spacing == 0:
self.pixel_spacing = temp_ds.PixelSpacing # UPDATE: pixel spacing
except:
self.broken = True
return
current_sl = -1
frames = 0
increasing = False
indices = []
for idx, slice_loc in enumerate(slice_locations):
if abs(slice_loc -
current_sl) > 0.01: # this means a new slice is started
self.num_slices += 1
self.num_frames = max(self.num_frames, frames)
frames = 0
indices.append(idx)
if (slice_loc - current_sl) > 0.01:
increasing = True
else:
increasing = False
current_sl = slice_loc
frames += 1
if self.num_slices != 0 and self.num_frames != 0:
self.load_matrices(images, indices, increasing, slice_locations,
file_paths)
else:
logger.warning(
"There are no frames. This folder should be deleted. Path: {}".
format(folder_name))
self.num_images = len(images)
