But a year ago Medicare cut the price it pays for imaging, so Gruen gets paid 15% to 50% less for each order, depending on the type of scan.

FORBES: Cranking Up the Volume

At most stores you will be able to use Google Wallet to show your offer at the register, where the cashier will either scan it or manually type it in.

ENGADGET: Google Wallet mobile payment service, Google Offers announced

After the stress test, your cardiologist may or may not opt to have you undergo another type of CT test called a Calcium-score Screening Heart Scan.

FORBES: My Visit with a Cardiologist, and What You Should Know About Your Heart

To use a card at checkout, a cashier can either scan the card's bar code from the smartphone or type in the member's ID number.

WSJ: Store Loyalty Cards on Your Smartphone

Both YottaMark and FoodLogiq offer systems that let shoppers type a text code into a mobile phone or home computer, or scan a bar-code using a phone's built-in camera, to find out when the tomatoes on the shelf were picked and which field they came from.

ECONOMIST: Tech.view

You may not have signs or symptoms if your pheochromocytoma is associated with a genetic condition, such as multiple endocrine neoplasia, type II (MEN II), because it's likely to be found on a scan before symptoms start.

CNN: Pheochromocytoma

If we are to have medicines tailored to our own versions of specific diseases, rather than the one-size-fits-all type of potions and pills with which we're treated today, then each of us will need a genome scan in our medical files.

ECONOMIST: Peering into your medical future is risky