这个程序的输入参数是一个图像序列的文件名模式和输出的三维体数据的文件名。它首先使用VTK库中的vtkImageStack对象来创建一个空的图像堆栈。然后使用vtkImageReader2Factory类和vtkImageReader2类来读入图像序列。对于每个图像，它使用vtkImageReslice类将其大小和分辨率与第一个图像匹配，并将其添加到图像堆栈中。最后，它使用vtkImageAppendComponents类将图像堆栈中的所有图像组合成一个三维体数据，并使用vtkMetaImageWriter类将其写入磁盘。

#include <vtkSmartPointer.h>
#include <vtkImageStack.h>
#include <vtkImageData.h>
#include <vtkImageReader2Factory.h>
#include <vtkImageReader2.h>
#include <vtkImageReslice.h>
#include <vtkImageAppendComponents.h>
#include <vtkImageCast.h>
#include <vtkMetaImageWriter.h>

int main(int argc, char *argv[])
{
    if (argc < 3)
    {
        std::cerr << "Usage: " << argv[0] << " <input_image_pattern> <output_image>" << std::endl;
        return EXIT_FAILURE;
    }

    // Create an image stack object
    vtkSmartPointer<vtkImageStack> imageStack = vtkSmartPointer<vtkImageStack>::New();

    // Read in the series of 2D images
    vtkSmartPointer<vtkImageReader2Factory> readerFactory = vtkSmartPointer<vtkImageReader2Factory>::New();
    vtkSmartPointer<vtkImageReader2> reader = readerFactory->CreateImageReader2(argv[1]);
    reader->SetFileName(argv[1]);
    reader->Update();

    // Set up the image reslice filter
    vtkSmartPointer<vtkImageReslice> reslice = vtkSmartPointer<vtkImageReslice>::New();
    reslice->SetInputConnection(reader->GetOutputPort());
    reslice->SetOutputSpacing(reader->GetOutput()->GetSpacing()[0], reader->GetOutput()->GetSpacing()[1], 1.0);
    reslice->Update();

    // Append the resliced images to the image stack
    imageStack->AddImage(reslice->GetOutput());

    // Loop through the remaining images in the series and append them to the stack
    for (int i = 2; i <= reader->GetNumberOfFileNames(); i++)
    {
        // Read in the next image
        reader->SetFileName(reader->GetFileNames()[i-1]);
        reader->Update();

        // Reslice the image to match the first image
        vtkSmartPointer<vtkImageReslice> reslice = vtkSmartPointer<vtkImageReslice>::New();
        reslice->SetInputConnection(reader->GetOutputPort());
        reslice->SetOutputSpacing(reader->GetOutput()->GetSpacing()[0], reader->GetOutput()->GetSpacing()[1], 1.0);
        reslice->Update();

        // Append the resliced image to the image stack
        imageStack->AddImage(reslice->GetOutput());
    }

    // Combine the images in the image stack into a single 3D volume
    vtkSmartPointer<vtkImageAppendComponents> append = vtkSmartPointer<vtkImageAppendComponents>::New();
    for (int i = 0; i < imageStack->GetNumberOfImages(); i++)
    {
        vtkSmartPointer<vtkImageCast> cast = vtkSmartPointer<vtkImageCast>::New();
        cast->SetInputData(imageStack->GetImage(i));
        cast->SetOutputScalarTypeToFloat();
        cast->Update();
        append->AddInputData(cast->GetOutput());
    }
    append->Update();

    // Write out the 3D volume as a meta image
    vtkSmartPointer<vtkMetaImageWriter> writer = vtkSmartPointer<vtkMetaImageWriter>::New();
    writer->SetFileName(argv[2]);
    writer->SetInputData(append->GetOutput());
    writer->Write();

    return EXIT_SUCCESS;
}复制