Not sure why do you need a tool when you have MATLAB functionality?

info = dicominfo('US-PAL-8-10x-echo.dcm');

Data = dicomread(info); %This is a 4D Structure (e.g., 10 images)

save dcmFile info Data;

Dear Arvind Kumar , Matlab itself a powerful tool that can convert any readable data file format into matlab (.mat) file. First, you need to download the DICOM files and save it into a folder. Follow the set of code to execute the task in Matlab software:

Opt-1: Read and visualize a single DICOM file

%%To read and visualize any sample DICOM file in Matlab

I = dicomread('filename.dcm'); %Read Image Data from DICOM Files

figure;

imshow(I,'DisplayRange',[]) %View DICOM Images

Opt-2: Read DICOM images from folder and save them into .mat file

%% Read DICOM images from folder and save them into .mat file

inputFilename = 'myDicomFile.dcm';

inputFolder = '/Users/somePath/dicomFiles';

% read the file

[X,map] = dicomread(fullfile(inputFolder,inputFilename));

% now write to a mat file

outputFilename = 'myMatFile.mat';

outputFolder = '/Users/somePath/matFiles';

save(fullfile(outputFolder,outputFilename),'X','map');