Cook macaroni according to package directions. Drain, rinse under cold running water. Drain well. In a small bowl stir together yogurt, salad dressing, parmesan cheese and garlic. In a large bowl toss together macaroni, salad dressing mixture, cabbage and carrots, cucumber and tomato. Cover; quick chill in the freezer for 10 minutes. Serve atop lettuce if desired. makes 6 servings. Nutrition information per serving: (131 cal., 3 g. fat, 2 mg. chol., 155 mg. sodium.)