x 0.82</span></span>
<span><span class="co">#&gt;   Voxel Units     : mm</span></span>
<span><span class="co">#&gt;   Time Units      : Unknown</span></span></code></pre></div>
<p>We see the output is a <code>nifti</code> object. We can think of this as an array with additional information (called a header). We can do simple operations on the image, such as <code>sum</code>:</p>
<div class="sourceCode" id="cb4"><pre class="downlit sourceCode r">
<code class="sourceCode R"><span><span class="fu"><a href="htt