How can I extract single frames from multi-frame DICOM file

[Leandro Marques]

Hello,

How can I extract single frames from multi-frame DICOM file? I saw an example with dcm4che-tool-emf2sf but this functionality is limited to EnhancedCTImage, EnhancedMRImage and EnhancedPETImage. I need to apply this feature for all images types.

How can I proceed?

BR, Leandro.

[Leandro Marques]

After better understanding of problem I discovered that my scenario was a little different. In fact I needed to extract multiple images from tag Pixel Data (7FE0, 0010) with some offset. Through site Dicom Is Easy I understood how can I calculate the pixel data length for each image. The mathematical formula that I used was: ROWS * COLUMNS * NUMBER_OF_FRAMES * SAMPLES_PER_PIXEL * (BITS_ALLOCATED/8). More details can be seen at http://dicomiseasy.blogspot.com.br/2012/08/chapter-12-pixel-data.html. My code that I used was:

// Extract multiple images from tag pixel data

int rows = data.getInt(Tag.Rows, 1);

int columns = data.getInt(Tag.Columns, 1);

int samplePerPixel = data.getInt(Tag.SamplesPerPixel, 1);

int bitsAllocated = data.getInt(Tag.BitsAllocated, 8);

// frame size in number of bytes

int frameSize = rows * columns * samplePerPixel * bitsAllocated / 8;

// raw pixel data

byte[] raw = data.getBytes(Tag.PixelData);

int from = 0;

int to = frameSize;

for (int frame = 0; frame < raw.length/frameSize; frame++) {

      byte[] image = Arrays.copyOfRange(raw, from, to);

      data.remove(Tag.PixelData);

      data.setBytes(Tag.PixelData, VR.OW, image);

      saveDicomFile(editorFolder, imagesName.get(frame).replace(IMAGE_FORMAT, DICOM_FILE), data, transferSyntax);

      from += frameSize;

      to += frameSize;

}

Im my case this solution solved my problem.