Eng | 繁 體 | 简 体



  • It depends on clinical condition. For most of the CT examination, CM injection is required to better define the blood vessels and to accentuate the appearance between different tissues, e.g. abdominal aortogram, liver cancer and lung cancer.

  • Some patients may experience a salty taste, flush of heat, slight nausea, or mild itching sensation from an intravenous contrast injection. These sensations usually disappear within a minute or two. Radiographers and radiologists have the equipment and training to help patients through these minor reactions and to handle more severe reactions. Severe reactions such as shortness of breath or experience swelling in the throat are very rare, but do occur. Fortunately, with the safety of the newest contrast materials, these adverse effects are very rare.

  • Delayed reactions to CM occurring more than an hour (mostly about 4-6 hours) after CM injection have been reported in about 4% of the population. Treatment, if necessary, is symptomatic.

  • After intravenous administration of contrast medium (CM), trace amount of CM goes into the mother's milk in a 24-hour period. Nursing mothers should wait 24 hours after CM injection before resuming breast feeding.

  • Risk related to contrast medium, refer to Q2.
    Risk related to radiation is minimal for adults and should produce no effects, but not for foetus in a pregnant women.
    If you are pregnant, please inform your doctor or our staff before the examination.