以下のコードのように、uiimageviewを使用してセルaccessoryTypeを適用してみることができます。
cell.accessoryView = myAccessoryUIImageView;
セルaccessoryviewuiimageviewが正しく整列しない以下のコードを試してください:
UIView* accessoryView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 24, 50)];
UIImageView* accessoryViewImage = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"accessory_image.png"]];
accessoryViewImage.center = CGPointMake(12, 25);
[accessoryView addSubview:accessoryViewImage];
[cell setAccessoryView:accessoryView];
[accessoryViewImage release];//not use this line your ios sdk in 5.0 and above!
[accessoryView release];//not use this line your ios sdk in 5.0 and above!