 simple 4D brain image</span></span></span>
<span class="r-in"><span><span class="va">dim</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="fl">64</span>, <span class="fl">64</span>, <span class="fl">32</span>, <span class="fl">10</span><span class="op">)</span>  <span class="co"># 64x64x32 volume with 10 time points</span></span></span>
<span class="r-in"><span><span class="va">data</span> <s