dynamicSPECT/cardiacSPECT/parseDicom.py

import os
import sys
import dicom
import numpy as np
import re
import slicer
from slicer.ScriptedLoadableModule import *

#rom os import listdir
#from os.path import isfile, join
#onlyfiles = [f for f in listdir(mypath) if isfile(join(mypath, f))]
#import Tkinter as tk
#from Tkinter import filedialog

#root = tk.Tk()
#root.withdraw()
#file_path = filedialog.askopenfilename()
class parseDicom(ScriptedLoadableModule):
  def __init__(self, parent):
    ScriptedLoadableModule.__init__(self, parent)
    parent.title = "parseDicom"
    parent.categories = ["Examples"]
    parent.dependencies = []
    parent.contributors = ["Andrej Studen (FMF/JSI)"] # replace with "Firstname Lastname (Org)"
    parent.helpText = """
    Parse dynamic SPECT DICOM files
    """
    parent.acknowledgementText = """
    This module was developed within the frame of the ARRS sponsored medical
    physics research programe to investigate quantitative measurements of cardiac
    function using sestamibi-like tracers
    """ # replace with organization, grant and thanks.
    self.parent = parent

class parseDicomWidget(ScriptedLoadableModuleWidget):
    def setup(self):
        ScriptedLoadableModuleWidget.setup(self)
        self.logic=parseDicomLogic(self)

class parseDicomLogic(ScriptedLoadableModuleLogic):

    def __init__(self,parent):
        ScriptedLoadableModuleLogic.__init__(self, parent)

    def setURIHandler(self,net):
        self.net=net

    def filelist(self,mypath):
        if mypath.find('labkey://')==0:
            print("Using labkey")
            labkeyPath=re.sub('labkey://','',mypath)
            #not sure if labkey is available, so try it
            #url=slicer.modules.labkeySlicerPythonExtensionWidget.serverURL.text
            #print("Seting url={}".format(url))
            ok, files=self.net.listRemoteDir(labkeyPath)
            if not ok:
                print "Error accessing path"
                return []
            files=[self.net.GetRelativePathFromLabkeyPath(f) for f in files]

        if mypath.find('file://')==0:
            print("Using local files")
            localPath=re.sub('file://','',mypath)
            files = [os.path.join(localPath,f) for f in os.listdir(localPath)
                if os.path.isfile(os.path.join(localPath, f))]

        return files

    def getfile(self,origin,f):

        if origin.find('labkey')==0:
            try:
                #not sure if labkey is available, but try it
                print("Using labkey")
                print("Server:{0}, file:{1}".format(self.net.GetHostName(),f))
                localPath=self.net.DownloadFileToCache(f)
                #return [self.net.readFileToBuffer(f),1]
                return [open(localPath,'rb'),1]
            except:
                print('Could not access labkey. Exiting')
                return ['NULL',0]

        if origin.find('file')==0:
            print("Using local directory")
            return [open(f,'rb'),1]

        return ['NULL',0]

    def readMasterFile(self,g):
        #this is the "master" file where data on other files can be had
        #here we found out the duration of the frame and their distribution through
        #phases and cycles
        try:
            plan = dicom.read_file(g)
        except:
            print ("{}: Not a dicom file").format(g)
            return False

        try:
            self.nframe=plan[0x0019,0x10a5].value;
        except:
            print ("{}: Not a master file").format(g)
            return False
        if not (type(self.nframe) is list) :
            print("nframe not a list")
            return False

        #nframe now holds for index i total number of frames collected up
        #to the end of each phase

        for i in range(1,len(self.nframe)):
            self.nframe[i]+=self.nframe[i-1]

        self.frame_start=plan[0x0019,0x10a7].value
        self.frame_stop=plan[0x0019,0x10a8].value
        self.frame_duration=plan[0x0019,0x10a9].value

        self.frame_time=np.zeros(self.nframe[-1]);
        self.frame_data=np.empty([1,1,1,self.nframe[-1]])
        self.center = [0,0,0]
        self.pixel_size =[0,0,0]
        self.frame_orientation=[0,0,0,0,0,0]
        return True

    def readNMFile(self,g):

        try:
            plan = dicom.read_file(g)
        except:
            print ("{}: Not a dicom file").format(g)
            return False

        try:
            pf=plan[0x0018,0x5020]
        except:
            print("Not a NM file. Exiting")
            return False

        try:
            phase=plan[0x0035,0x1005].value
            cycle=plan[0x0035,0x1004].value
        except:
            print("Missing phase/cycle values")
            return False

        #convert phase/cycle to frame index
        off=0
        if phase > 1:
            off=self.nframe[phase-2]
        ifi=off+cycle-1

        #from values in the master file determine frame time
        #(as the mid point between starting and ending the frame)
        self.frame_time[ifi]=0.5*(self.frame_start[ifi]+self.frame_stop[ifi]); #in ms

        print "({},{}) converted to {} at {} for {}".format(
            phase,cycle,ifi,self.frame_time[ifi],self.frame_duration[ifi])


#play with pixel data
        if self.frame_data.shape[0] == 1:
            sh=np.transpose(plan.pixel_array,self.axisShift).shape;
            sh=list(sh)
            sh.append(self.nframe[-1])#add number of time slots
            self.frame_data=np.empty(sh)
            print "Setting frame_data to",sh

        #check & update pixel size
        pixel_size_read=[plan.PixelSpacing[0],plan.PixelSpacing[1],
                    plan.SliceThickness]

        for i in range(0,3):
            if self.pixel_size[i] == 0:
                self.pixel_size[i] = float(pixel_size_read[i])
            if abs(self.pixel_size[i]-pixel_size_read[i]) > 1e-3:
                print 'Pixel size mismatch {.2f}/{.2f}'.format(self.pixel_size[i],
                pixel_size_read[i])

        center_read=plan.DetectorInformationSequence[0].ImagePositionPatient
        print "Stored center at ({0},{1},{2})".format(self.center[0],self.center[1],self.center[2])
        print "Read   center at ({0},{1},{2})".format(center_read[0],center_read[1],center_read[2])
        for i in range(0,3):
            if self.center[i] == 0:
                self.center[i] = float(center_read[i])
            if abs(self.center[i]-center_read[i]) > 1e-3:
                print 'Image center mismatch {.2f}/{.2f}'.format(self.center[i],
                    center_read[i])

        frame_orientation_read=plan.DetectorInformationSequence[0].ImageOrientationPatient
        for i in range(0,6):
            if self.frame_orientation[i] == 0:
                self.frame_orientation[i] = float(frame_orientation_read[i])
            if abs(self.frame_orientation[i]-frame_orientation_read[i]) > 1e-3:
                print 'Image orientation mismatch {.2f}/{.2f}'.format(
                    self.frame_rotation[i], frame_orientation_read[i])




        self.frame_data[:,:,:,ifi]=np.transpose(plan.pixel_array,self.axisShift)

        return True

    def readCTFile(self,g):

        try:
            plan = dicom.read_file(g)
        except:
            print ("{}: Not a dicom file").format(g)
            return False


        if plan.Modality != 'CT':
            print ('{}: Not a CT file').format(g)
            return False

        #this doesn't work in 2019 data version
        #if re.match("AC",plan.SeriesDescription) == None:
        #    print (plan.SeriesDescription)
        #    print ('Not a AC file')
        #    continue
        try:
            iType=plan.ImageType
        except:
            print "Image type not found"
            return False

        if iType[3].find("SPI")<0:
            print "Not a spiral image"
            return False



        print '.',
        self.ct_data.append(plan.pixel_array)
        self.ct_idx.append(plan.InstanceNumber)
        self.ct_z.append(plan.ImagePositionPatient[2])

        pixel_size_read=[plan.PixelSpacing[0],plan.PixelSpacing[1],
            plan.SliceThickness]


        for i in range(0,3):
            if self.ct_pixel_size[i] == 0:
                self.ct_pixel_size[i] = float(pixel_size_read[i])
            if abs(self.ct_pixel_size[i]-pixel_size_read[i]) > 1e-3:
                print 'Pixel size mismatch {.2f}/{.2f}'.format(self.ct_pixel_size[i],
                    pixel_size_read[i])

        for i in range(0,2):
            if self.ct_center[i] == 0:
                self.ct_center[i] = float(plan.ImagePositionPatient[i])
            if abs(self.ct_center[i]-plan.ImagePositionPatient[i]) > 1e-3:
                    print 'Image center mismatch {.2f}/{.2f}'.format(self.ct_center[i],
                    plan.ImagePositionPatient[i])
    #not average, but minimum (!) why??

        if plan.ImagePositionPatient[2]<self.ct_center[2]:
            self.ct_center[2]=plan.ImagePositionPatient[2]

        for i in range(0,6):
            if self.ct_orientation[i] == 0:
                self.ct_orientation[i] = float(plan.ImageOrientationPatient[i])
            if abs(self.ct_orientation[i]-plan.ImageOrientationPatient[i]) > 1e-3:
                print 'Image orientation mismatch {0:.2f}/{1:.2f}'.format(self.ct_orientation[i],
                plan.ImageOrientationPatient[i])

        return True

    def readMasterDirectory(self,mypath):
        self.axisShift=(2,1,0)

        print("Reading master from {}").format(mypath)
        origin=re.sub('([^:/])://(.*)$',r'\1',mypath)

        relativeFiles=self.filelist(mypath)
        for f in relativeFiles:
            print '{}:'.format(f)

            g,ok=self.getfile(origin,f)
            if not(ok):
                return

            if self.readMasterFile(g):
                break


    def readNMDirectory(self,mypath):

        onlyfiles=self.filelist(mypath)
        origin=re.sub('([^:/])://(.*)$',r'\1',mypath)
        for f in onlyfiles:

            g,ok=self.getfile(origin,f)
            if not(ok):
                continue

            self.readNMFile(g)





        return [self.frame_data,self.frame_time,self.center,
            self.pixel_size,self.frame_orientation]

    def readCTDirectory(self,mypath):
        onlyfiles=self.filelist(mypath)
        origin=re.sub('([^:/])://(.*)$',r'\1',mypath)

        self.ct_data = []
        self.ct_idx = []
        self.ct_z = []
        self.ct_pixel_size = [0,0,0]
        self.ct_center = [0,0,0]
        self.ct_center[2]=1e30
        self.ct_orientation=[0,0,0,0,0,0]
        for f in onlyfiles:
            print '{}:'.format(f)

            g,ok=self.getfile(origin,f)
            if not(ok):
                return

            self.readCTFile(g)

        nz=len(self.ct_idx)
        #not average, again
        #ct_center[2]/=nz
        sh=self.ct_data[-1].shape
        sh_list=list(sh)
        sh_list.append(nz)
        data_array=np.zeros(sh_list)

        for k in range(0,nz):
            kp=int(np.round((self.ct_z[k]-self.ct_center[2])/self.ct_pixel_size[2]))
            data_array[:,:,kp]=np.transpose(self.ct_data[k])

        return data_array,self.ct_center,self.ct_pixel_size,self.ct_orientation