Load external images in WPF via XAML ?

<StackPanel Name="stackPanel4" Margin="5">
                    <StackPanel.Resources>
                     <AiPede:CellTemplateSelector x:Key="CellTemplateSelectorImageAndText">
                            <AiPede:CellTemplateSelector.ImageAndTextCell>
                                <DataTemplate>
                                    <StackPanel Orientation="Vertical">
                                        <Image x:Name="Imagem" Width="57" Height="57" HorizontalAlignment="Center" VerticalAlignment="Center" Source="pack://siteoforigin:,,,/img/43.png"/>
                                        <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" TextWrapping="Wrap" Text="{Binding Produto}"/>
                                    </StackPanel>
                                </DataTemplate>
                            </AiPede:CellTemplateSelector.ImageAndTextCell>
                        </AiPede:CellTemplateSelector>
                    </StackPanel.Resources>
                    <sdk:Label Content="Disponíveis" FontFamily="Portable User Interface" FontSize="14" FontWeight="Bold" Foreground="#FF686765" Name="label2" Margin="5" />
                    <telerik:RadGridView Name="rgvBebidasDisponiveis" ShowGroupPanel="False" Width="220" Height="383" IsReadOnly="True" AutoGenerateColumns="False" IsSynchronizedWithCurrentItem="False">
                        <telerik:RadGridView.Columns>
                            <telerik:GridViewDataColumn Header="Produto" CellTemplateSelector="{StaticResource CellTemplateSelectorImageAndText}" Width="*"/>
                        </telerik:RadGridView.Columns>
                    </telerik:RadGridView>
                </StackPanel>