cxDicomConverter.cpp

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/*=========================================================================
This file is part of CustusX, an Image Guided Therapy Application.

Copyright (c) 2008-2014, SINTEF Department of Medical Technology
All rights reserved.

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modification, are permitted provided that the following conditions are met:

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   this list of conditions and the following disclaimer.

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   may be used to endorse or promote products derived from this software 
   without specific prior written permission.

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#include "cxDicomConverter.h"
#include "ctkDICOMDatabase.h"
#include "cxTypeConversions.h"
#include "cxTime.h"
#include "vtkImageData.h"
#include "cxRegistrationTransform.h"
#include <vtkImageAppend.h>
#include <vtkImageCast.h>
#include "cxReporter.h"

#include "cxLogger.h"
#include "ctkDICOMItem.h"
#include "dcfilefo.h" // DcmFileFormat
#include "dcdeftag.h" // defines all dcm tags
#include "dcmimage.h"
#include <string.h>

#include "cxDicomImageReader.h"

typedef vtkSmartPointer<vtkImageAppend> vtkImageAppendPtr;

namespace cx
{

DicomConverter::DicomConverter()
{
}

DicomConverter::~DicomConverter()
{
}

void DicomConverter::setDicomDatabase(ctkDICOMDatabase* database)
{
        mDatabase = database;
}

QString DicomConverter::generateUid(DicomImageReaderPtr reader)
{
        QString seriesDescription = reader->item()->GetElementAsString(DCM_SeriesDescription);
        QString seriesNumber = reader->item()->GetElementAsString(DCM_SeriesNumber);

        // uid: uid _ <timestamp>
        // name: find something from series
        QString currentTimestamp = QDateTime::currentDateTime().toString(timestampSecondsFormat());
        QString uid = QString("%1_%2_%3").arg(seriesDescription).arg(seriesNumber).arg(currentTimestamp);
        uid = this->convertToValidFilename(uid);
        return uid;
}

QString DicomConverter::convertToValidFilename(QString text) const
{
        QStringList illegal;
        illegal << "\\s" << "\\." << ":" << ";" << "\\<" << "\\>" << "\\*" << "\\^" << ",";
        QRegExp regexp(QString("(%1)").arg(illegal.join("|")));
        text = text.replace(regexp, "_");
        return text     ;
}

QString DicomConverter::generateName(DicomImageReaderPtr reader)
{
        QString seriesDescription = reader->item()->GetElementAsString(DCM_SeriesDescription);
        QString name = QString("%1").arg(seriesDescription);
        return name;
}

ImagePtr DicomConverter::createCxImageFromDicomFile(QString filename, bool ignoreLocalizerImages)
{
        DicomImageReaderPtr reader = DicomImageReader::createFromFile(filename);
        if (!reader)
        {
                reportWarning(QString("File not found: %1").arg(filename));
                return ImagePtr();
        }

        if(ignoreLocalizerImages && reader->isLocalizerImage())
        {
                reportWarning(QString("Localizer image removed from series: %1").arg(filename));
                return ImagePtr();
        }

        if (reader->getNumberOfFrames()==0)
        {
                reportWarning(QString("Found no images in %1, skipping.").arg(filename));
                return ImagePtr();
        }

        QString uid = this->generateUid(reader);
        QString name = this->generateName(reader);
        cx::ImagePtr image = cx::Image::create(uid, name);

        vtkImageDataPtr imageData = reader->createVtkImageData();
        if (!imageData)
        {
                reportWarning(QString("Failed to create image for %1.").arg(filename));
                return ImagePtr();
        }
        image->setVtkImageData(imageData);

        QString modality = reader->item()->GetElementAsString(DCM_Modality);
        image->setModality(modality);

        DicomImageReader::WindowLevel windowLevel = reader->getWindowLevel();
        image->setInitialWindowLevel(windowLevel.width, windowLevel.center);

        Transform3D M = reader->getImageTransformPatient();
        image->get_rMd_History()->setRegistration(M);

        reportDebug(QString("Image created from %1").arg(filename));
        return image;
}

std::vector<ImagePtr> DicomConverter::createImages(QStringList files)
{
        std::vector<ImagePtr> retval;
        for (int i=0; i<files.size(); ++i)
        {
                bool ignoreSpesialImages = true;
                ImagePtr image = this->createCxImageFromDicomFile(files[i], ignoreSpesialImages);
                if (image)
                        retval.push_back(image);
        }
        return retval;
}

std::map<double, ImagePtr> DicomConverter::sortImagesAlongDirection(std::vector<ImagePtr> images, Vector3D  e_sort)
{
        std::map<double, ImagePtr> sorted;
        for (int i=0; i<images.size(); ++i)
        {
                Vector3D pos = images[i]->get_rMd().coord(Vector3D(0,0,0));
                double dist = dot(pos, e_sort);

                sorted[dist] = images[i];
        }
        return sorted;
}

bool DicomConverter::slicesFormRegularGrid(std::map<double, ImagePtr> sorted, Vector3D e_sort) const
{
        std::vector<Vector3D> positions;
        std::vector<double> distances;
        for (std::map<double, ImagePtr>::iterator iter=sorted.begin(); iter!=sorted.end(); ++iter)
        {
                ImagePtr current = iter->second;

                Vector3D pos = current->get_rMd().coord(Vector3D(0,0,0));
                positions.push_back(pos);

                if (positions.size()>=2)
                {
                        Vector3D p0 = positions[positions.size()-2];
                        Vector3D p1 = positions[positions.size()-1];
                        double dist = dot(p1-p0, e_sort);
                        distances.push_back(dist);

                        Vector3D tilt = cross(p1-p0, e_sort);
                        double sliceGantryTiltTolerance = 0.001;
                        if (!similar(tilt.length(), 0.0, sliceGantryTiltTolerance))
                        {
                                reportError(QString("Dicom convert: found gantry tilt: %1, cannot create image.").arg(tilt.length()));
                                return false;
                        }
                }

                if (distances.size()>=2)
                {
                        double d0 = distances[distances.size()-2];
                        double d1 = distances[distances.size()-1];
                        double sliceSpacingTolerance = 0.01;
                        if (!similar(d0, d1, sliceSpacingTolerance))
                        {
                                reportError(QString("Dicom convert: found uneven slice spacing: %1 != %2, cannot create image.").arg(d0).arg(d1));
                                return false;
                        }
                }
        }

        return true;
}

double DicomConverter::getMeanSliceDistance(std::map<double, ImagePtr> sorted) const
{
        if (sorted.size()==0)
                return 0;

        // check for multislice image
        vtkImageDataPtr first = sorted.begin()->second->getBaseVtkImageData();
        if (first->GetDimensions()[2]>1)
                return first->GetSpacing()[2];

        if (sorted.size()<2)
                return 0;

        // use average of all slices
        double p1 = sorted.rbegin()->first;
        double p0 = sorted.begin()->first;
        return (p1-p0)/sorted.size();
}

ImagePtr DicomConverter::mergeSlices(std::map<double, ImagePtr> sorted) const
{
        vtkImageAppendPtr appender = vtkImageAppendPtr::New();
        appender->SetAppendAxis(2);

        ImagePtr retval = sorted.begin()->second;

        int i = 0;

        for (std::map<double, ImagePtr>::iterator iter=sorted.begin(); iter!=sorted.end(); ++iter)
        {
                ImagePtr current = iter->second;

                // Set window width and level to the values of the middle frame
                if (i == sorted.size() / 2)
                        retval->setInitialWindowLevel(current->getInitialWindowWidth(), current->getInitialWindowLevel());
                ++i;

                //Convert all slices to same format
                vtkImageCastPtr imageCast = vtkImageCastPtr::New();
                imageCast->SetInputData(current->getBaseVtkImageData());
                imageCast->SetOutputScalarTypeToShort();
                imageCast->Update();

                appender->AddInputData(imageCast->GetOutput());
        }
        appender->Update();

        vtkImageDataPtr wholeImage = appender->GetOutput();
        Eigen::Array3d spacing(wholeImage->GetSpacing());
        spacing[2] = this->getMeanSliceDistance(sorted);
        wholeImage->SetSpacing(spacing.data());

        retval->setVtkImageData(wholeImage);

        return retval;
}

ImagePtr DicomConverter::convertToImage(QString series)
{
        QStringList files = mDatabase->filesForSeries(series);

        std::vector<ImagePtr> images = this->createImages(files);

        if (images.empty())
                return ImagePtr();

        if (images.size()==1)
        {
                return images.front();
        }

        Vector3D e_sort = images.front()->get_rMd().vector(Vector3D(0,0,1));

        std::map<double, ImagePtr> sorted = this->sortImagesAlongDirection(images, e_sort);

        if (!this->slicesFormRegularGrid(sorted, e_sort))
                return ImagePtr();

        ImagePtr retval = this->mergeSlices(sorted);
        return retval;
}

} /* namespace cx */