can’t get field value inside [each] loop

I want to access {@ems_system.ID} PODS from within the [each] loop:

<table class="avia-table avia-data-table avia_pricing_default avia-builder-el-1 avia-builder-el-no-sibling ">
<tbody>
<tr class="avia-heading-row">
<th width="20%">MEDICAL DIRECTOR</th>
<th width="20%">EMS SYSTEM</th>
<th width="60%">  </th>
</tr>
[/before]

<tr class="row-design" >
	<td class="cell-design">{@medical_director} {@medical_director_last}</td>
	<td class="cell-design">{@post_title} ({@ID})</td>
	<td>
		<table vertical-align="top">
			<tr>
			<td width="40%" class="cell-design-hospital">STROKE HOSPITALS SERVED<br>NATIONAL CERTIFICATION</td>
				<td width="30%" class="cell-design-hospital">STROKE COORDINATOR CONTACT INFO</td>
				<td width="30%" class="cell-design-hospital">YES ? NO</td>
			</tr>
		[each stroke_hospitals_served]
			<tr>
			<td width="40%" class="cell-design-hospital"><strong>{@stroke_hospitals_served.post_title} ({@ID})</strong><br>
				{@stroke_hospitals_served.national_certification}
				<br> ems_system.@ID is {@ems_system.ID}
				</td>
			<td width="30%" class="cell-design-hospital"><strong>{@stroke_hospitals_served.stroke_coordinator}<br>
				<a href="mailto:{@stroke_hospitals_served.stroke_coordinator_email}">Email</a><br>
				{@stroke_hospitals_served.stroke_coordinator_phone}</strong>
			<td width="30%" class="cell-design-hospital">

[gravityform id="18" title="false" description="false" ajax="true" field_values="hospital_slug={@stroke_hospitals_served.ID}&site_shared_code={@stroke_hospitals_served.site_shared_code}" ]
			</tr>
	[/each]
	</table></td>

</tr>
[after]
</tbody>
</table>
[/after]

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