why do they use contrast in a ct scan

why do they use contrast in a ct scan

Which imaging exams use contrast materials? Barium-sulfate contrast materials that are swallowed or administered by mouth (orally) are used to enhance x-ray and CT images of the (GI) tract, including: the In some situations, iodine-based contrast materials are substituted for barium-sulfate contrast materials for oral administration. Barium-sulfate contrast materials that are administered by enema (rectally) are used to enhance x-ray and CT images of the lower gastrointestinal (GI) tract (colon and rectum). In some situations, iodine-based contrast materials are substituted for barium-sulfate contrast materials for rectal administration. Iodine-based contrast materials injected into a vein (intravenously) are used to enhance x-ray and CT images. Gadolinium injected into a vein

 why do women appear to be slightly knock kneed

why do women appear to be slightly knock kneed

How Much CoQ10 Should a Female Take? The typical recommended daily dose for CoQ10 is 30 to 200 milligrams per day for both women and men, according to Everyday Health. Children should not take. Are Hernias Common in Women? Hernia is not common to women, it frequently occurs in men compared to women, according to Ethicon. Although women may get other types of hernias, rare fem. How Can Someone Convert Men's Size to Women's Dress Size? The easiest way to convert men's sizes to women's is to take accurate measurements of the bust, waist and hips. ...

 why do we use pivot table in excel

why do we use pivot table in excel

Your data should be organized in a tabular format, and not have any blank rows or columns. Ideally, you can use an like in our example above. Tables are a great PivotTable data source, because rows added to a table are automatically included in the PivotTable when you refresh the data, and any new columns will be included in the PivotTable Fields List. Otherwise, you need to either, or use a. Data types in columns should be the same. For example, you shouldn't mix dates and text in the same column. PivotTables work on a snapshot of your data, called the cache, so your actual data doesn't get altered in any way. If you have limited experience with PivotTables, or are not sure how to get started, a Recommended PivotTable is a good choice. When you use this feature, Excel determines a

 why do white strips hurt my teeth

why do white strips hurt my teeth

What is Teeth Whitening Sensitivity? If you've ever experienced pain or discomfort while whitening your teeth, it may be the result of teeth whitening sensitivity. While achieving a beautiful smile can really help boost your self-confidence and make you feel great, you may question whether it's worth the pain. But if you do experience discomfort, know that while it can be uncomfortable, it doesn't cause any permanent damage to your teeth and typically doesn't last for very long. If you notice continued tooth whitening sensitivity, consult your dental professional. Before you swear off pearly whites because of your fear of teeth whitening sensitivity, you should know that there are whitening products formulated specifically for you. Having a beautiful smile doesn't have to be painful,

 why do we wear wedding rings on the left hand

why do we wear wedding rings on the left hand

In, a wedding ring is traditionally worn on the ring finger. This developed from the Roman "anulus pronubis" when a man would give a ring to the woman at their betrothal ceremony. Blessing the wedding ring and putting it on the bride's finger dates from the 11th century. In medieval, during the wedding ceremony the ring was placed in sequence on the thumb, index, middle, and ring fingers of the left hand. The ring was then left on the ring finger. In a few European countries, the ring is worn on the left hand prior to marriage, then transferred to the right during the ceremony. For example, a bride wears the ring on the left hand prior to the ceremony, then moves it to the right hand after the wedding. In England, the 1549 Prayer Book declared "the ring shall be placed on the left hand".

 why do we use gasoline to power cars

why do we use gasoline to power cars

Americans used about 392 million gallons of gasoline per day in 2016. With about 324 million people in the United States (as of December 31, 2016) that calculates to more than a gallon of gasoline every day for each person. Gasoline is one of the major fuels consumed in the United States and is the main product that U. S. oil refineries produce. U. S. consumers use gasoline in Cars, sport utility vehicles, light trucks, and motorcycles Equipment and tools used in construction, farming, forestry, and landscaping In 2016, gasoline accounted for about 60% of total transportation sector energy consumption, 48% of all petroleum consumption, and 17% of total U. S. energy consumption. Light-duty vehicles (cars, sport utility vehicles, and small trucks) account for about 90% of all gasoline

 why do they say god bless you

why do they say god bless you

Does your heart stop when you sneeze? No, your heart does not stop when you sneeze. A sneeze begins with a tickling sensation in the nerve endings that sends a message to your brain that it needs to rid itself of something irritating the lining of your nose. You first take a deep breath and hold it, which tightens your chest muscles. The pressure of air in your lungs increases, you close your eyes, your tongue presses against the roof of your mouth and suddenly your breath comes out fast through your nose. So where did the myth originate that your heart stops when you sneeze? The changing pressure in your chest due to sneezing also changes your blood flow, which may change the rhythm of your heartbeat. Dr. Richard Conti, past president of the American College of Cardiology, speculates

 why do want to be a police officer

why do want to be a police officer

A new police officer gets grilled with a series of exams, the toughest one of all being the interview. A face-to-face interview for the Police Academy is very different than any of those you might have faced before. It is a daunting experience, for you have to answer all sorts of. After reading this article, you may be interested in reading the article,бБ. How does one answer the question, Б Why do you want to become a police officer? You have the required commitment. You know how to deal with different types of people. You are socially competent. You are patient and tolerant. You perform well in stressful conditions. You have effective listening skills. You like working in a team environment. You have some qualities of leadership. You know how to initiate new ideas and to motivate

 why do we wear wedding ring on left hand

why do we wear wedding ring on left hand

In, a wedding ring is traditionally worn on the ring finger. This developed from the Roman "anulus pronubis" when a man would give a ring to the woman at their betrothal ceremony. Blessing the wedding ring and putting it on the bride's finger dates from the 11th century. In medieval, during the wedding ceremony the ring was placed in sequence on the thumb, index, middle, and ring fingers of the left hand. The ring was then left on the ring finger. In a few European countries, the ring is worn on the left hand prior to marriage, then transferred to the right during the ceremony. For example, a bride wears the ring on the left hand prior to the ceremony, then moves it to the right hand after the wedding. In England, the 1549 Prayer Book declared "the ring shall be placed on the left hand".

 why do vestigial structures persist in modern organisms

why do vestigial structures persist in modern organisms

It takes some time for a structure to completely lose its function, and then considerable amount of time after than for it to disappear completely. For example, the appendix is a vestigial structure. It still has some *traces* of its ancestral function. In herbivores, the cecum is the breeding ground for bacteria used for digesting cellulose. In purely carnivorous animals the cecum is reduced. In the omnivorous primates (humans, apes, and Old World monkeys of Asia and Africa), the cecum is mostly replaced with the appendix, which still has traces of its ancestral function, in that it may have some function in harboring good bacteria used in digestion, during disease. ...