Innovative Technology That Ensures Patient Safety

CT and ZP

Over the past several years, we have been dedicated to overhauling our entire inventory of CT scanners and replacing all machines with the best equipment available. This guarantees patients will be exposed to the smallest amount of radiation possible while still getting high-quality images.

ZP follows three principles which promise patient safety and low doses of radiation: ALARA (As Low As Reasonably Achievable), Image Wisely™, and Image Gently. Our commitment to these principles is reflected by the patent awarded to Dr. Steven Mendelsohn, CEO of Zwanger-Pesiri Radiology, in 2012, for a CT dose card (US Patent #: US8,281,996B2). This card was given to every patient after their scan to inform patients of the radiation dose they were exposed to during their test. Now this number is generated on every report so doctors and patients are kept informed.


How it Works

CT scans use X-rays taken from multiple angles as a patient is moved through the opening of the machine. An X-ray tube and high resolution digital detector rotate very fast inside the machine’s opening to obtain pictures from all different angles and produce detailed images of bones, soft tissue, organs, and blood vessels. The rotation of these parts is internal and cannot be detected by the patient. The images produced from a CT scan are significantly more detailed than a traditional X-ray. It is considered an essential tool to assess acute brain trauma, kidney stones, and other conditions.

The CT scanner takes many very thin two-dimensional pictures, which the computer can assemble into three-dimensional images. This allows the doctor to look layer by layer at the area being scanned and provides greater detail to aid in the diagnostic process.

Many CT scans require the use of a contrast dye. The contrast may be given in a drink that you consume prior to the scan or administered during the scan through an I.V. The contrast highlights certain parts of your body and helps to provide the sharpest images available.


Benefits of a CT Examination


CT can image bone, soft tissue, and blood vessels at the same time


CT scanning is painless, noninvasive, and accurate


CT imaging provides real-time imaging


CT scanners produce superior exams using a fraction of time and radiation exposure

How to Prepare

You must remove all jewelry and any other metallic objects such as hearing aids, jeans with metal zippers, body piercings, and removable dental work. Wearing a sweatsuit with no metal may prevent you from having to change into a gown.

Additional prep CT with I.V. contrast

Do not eat anything one hour prior to your exam time. You may drink clear liquids (example: water, ginger ale, apple juice). Keep hydrated before and after your exam.

If you have impaired kidney function, are diabetic, or are 70 years of age or older, we will perform an i-STAT creatinine level at the time of your exam to assess your kidney function. It is important to inform us if you are taking the medication hydroxyurea when making your appointment.

Additional prep CT with oral contrast

If you are receiving oral contrast, please pick up the contrast kit the day before your exam. If you are receiving Omnipaque oral contrast, refer to the Omnipaque oral contrast section below. If you are receiving Redi-CAT oral contrast, please ask your Zwanger-Pesiri representative for those specific instructions.

Omnipaque oral contrast prep for CT scan

Do not take if you have an iodine allergy.

Begin drinking the Omnipaque oral prep one hour and 40 minutes before your exam, preferably finishing 20 to 30 minutes before the exam time.

To prepare the contrast drink:

  • Pour HALF the contents of the Ominpaque bottle into the 32 oz. cup that was given to you.
  • Fill the cup with water up to approximately 1/2 inch from the top of the cup (approximately 30 oz).
  • Stir well and drink.
  • Discard the cup, contrast bottle and straw after use.

During the Test

First, the technologist ensures that you have no metal on your body, and reviews your medical history with you. You are then asked to lie on the scanning table, which is moved into the center of the machine, and asked to stay as still as possible to ensure the clearest images. Most exams last only a few minutes, depending on the body part.

The exam is non-invasive and the machine never touches your body. The technologist is available via intercom should the patient have any concerns during the exam.

Learn about Different Types of CT Exams

Why Choose Zwanger Pesiri?

Zwanger-Pesiri Radiology brings world-class expertise to the Long Island community. Our subspecialty-trained radiologists are Board Certified by the American Board of Radiology with fellowship training in a variety of specialties. They are highly-skilled, highly-knowledgeable, and make patient care a priority. To learn more, contact us today.

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