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For renal imaging and GFR studies, the patient receives an intravenous injection of 3 to 5 mCi (111-185 MBq) and the kidneys are imaged for 20 to 30 minutes. The GFR is calculated by a quantitative method using a combination of imaging and counting the radioactivity in serum and urine samples. Renal and brain perfusion studies use doses from 10 to 20 mCi (370-740 MBq). Both dynamic and static images are usually acquired for perfusion studies. For lung studies, 30 to 50 mCi (1.11-1.85 GBq) is placed in a closed, disposable nebulizer system. After 5 to 10 minutes of inhalation by the patient, the nebulizer is detached and patient images from various projections are obtained. Images are comparable to those obtained with xenon-133.

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Coping with Asthma

Coping with Asthma

If you suffer with asthma, you will no doubt be familiar with the uncomfortable sensations as your bronchial tubes begin to narrow and your muscles around them start to tighten. A sticky mucus known as phlegm begins to produce and increase within your bronchial tubes and you begin to wheeze, cough and struggle to breathe.

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