Please tell me your experience if you had this test

I weigh 315 and I am 5’5 and I feel I can not fit in the scanner , And I am Claustrophobic

the scanner is huge - I weighed well over 300 lbs and fit in there just fine. Also, it's not nearly as long as an MRI machine. I think it was maybe only a couple feet long - so your head isn't inside - and neither is the lower half of your body. It really just covers a large section of your torso.

what they do is stick you in the machine and take all kinds of measurements of your heart while you just lie there quietly. If this is the same test I had (which they called a nuclear stress test), once they're done getting these baseline tests, they'll inject something that'll make your heart race. It's supposed to mimic heavy exercise. Then they'll stick you back in the machine to take all the measurements again. The point is to see how your heart does under stress, and how long it takes it to recover.

the test was no biggie. The part where your heart is racing feels pretty weird, but it certainly isn't painful or anything. The rest of the time you're just lying in the machine - again, with your head and lower half of your body sticking out. It was pretty easy.