How can I read a 32-bit TIFF file in C#?

I am trying to load a 32-bit TIFF and read the RGBA values of the pixels. I have tried using LibTiff.Net, however I get this error when attempting to load it:

"Sorry, can not handle images with 32-bit samples"

Does anyone know of a way to accomplish this in C#? I don't want to reduce the pixel depth as these images contain data which will be used in scientific calculations.

Thanks for any and all help.

EDIT: Example:

var stream = File.Open(fileName, FileMode.Open);
TiffBitmapDecoder tiffDecoder = new TiffBitmapDecoder(  stream,
                                    BitmapCreateOptions.PreservePixelFormat | BitmapCreateOptions.IgnoreImageCache,
                                    BitmapCacheOption.None);
stream.Dispose();

BitmapSource bmpSource = tiffDecoder.Frames[0];

byte[] data;
JpegBitmapEncoder encoder = new JpegBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(bmpSource));
using (MemoryStream ms = new MemoryStream())
{
    encoder.Save(ms);
    data = ms.ToArray();
}

This give me the following error:

{"The handle is invalid. (Exception from HRESULT: 0x80070006 (E_HANDLE))"}

On the line

encoder.Frames.Add(BitmapFrame.Create(bmpSource));