How to release memory of image controls which are not in "field of view" of listview

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WPF

ListView

image

cache

C#6.0

Hi,

I have a listview with Image control, bound with Uri value (image path on disk).
I want to convert only those Uri in "Field of view" and dispose (or convert back to Uri) which goes out of "Field of View".

Thanks in advance.

What I have tried:

I have used IValueConverter to convert Uri to Image but ConvertBack is not firing.

<Image Source="{Binding PageSource,Mode=TwoWay, UpdateSourceTrigger=Explicit, Converter={StaticResource ImageConverter}}" HorizontalAlignment="Center" VerticalAlignment="Top"/>