Radiology is the medical specialty that uses medical imaging to diagnose and treat diseases within the human body. A variety of imaging techniques such as X-ray radiography, computed tomography, nuclear medicine including positron emission tomography, magnetic resonance imaging are used to diagnose or treat diseases. Interventional radiology is the performance of minimally invasive medical procedures with the guidance of imaging technologies such as X-ray radiography, computed tomography, nuclear medicine including positron emission tomography, magnetic resonance imaging; the modern practice of radiology involves several different healthcare professions working as a team. The radiologist is a medical doctor who has completed the appropriate post-graduate training and interprets medical images, communicates these findings to other physicians by means of a report or verbally, uses imaging to perform minimally invasive medical procedures; the nurse is involved in the care of patients before and after imaging or procedures, including administration of medications, monitoring of vital signs and monitoring of sedated patients.
The radiographer known as a "radiologic technologist" in some countries such as the United States, is a specially trained healthcare professional that uses sophisticated technology and positioning techniques to produce medical images for the radiologist and nurse to interpret. Depending on the individual's training and country of practice, the radiographer may specialize in one of the above-mentioned imaging modalities or have expanded roles in image reporting. Radiographs are produced by transmitting X-rays through a patient; the X-rays are projected through the body onto a detector. Röntgen discovered X-rays on November 8, 1895 and received the first Nobel Prize in Physics for their discovery in 1901. In film-screen radiography, an X-ray tube generates a beam of X-rays, aimed at the patient; the X-rays that pass through the patient are filtered through a device called an grid or X-ray filter, to reduce scatter, strike an undeveloped film, held to a screen of light-emitting phosphors in a light-tight cassette.
The film is developed chemically and an image appears on the film. Film-screen radiography is being replaced by phosphor plate radiography but more by digital radiography and the EOS imaging. In the two latest systems, the X-rays strike sensors that converts the signals generated into digital information, transmitted and converted into an image displayed on a computer screen. In digital radiography the sensors shape a plate, but in the EOS system, a slot-scanning system, a linear sensor vertically scans the patient. Plain radiography was the only imaging modality available during the first 50 years of radiology. Due to its availability and lower costs compared to other modalities, radiography is the first-line test of choice in radiologic diagnosis. Despite the large amount of data in CT scans, MR scans and other digital-based imaging, there are many disease entities in which the classic diagnosis is obtained by plain radiographs. Examples include various types of arthritis and pneumonia, bone tumors, congenital skeletal anomalies, etc.
Mammography and DXA are two applications of low energy projectional radiography, used for the evaluation for breast cancer and osteoporosis, respectively. Fluoroscopy and angiography are special applications of X-ray imaging, in which a fluorescent screen and image intensifier tube is connected to a closed-circuit television system; this augmented with a radiocontrast agent. Radiocontrast agents are administered by swallowing or injecting into the body of the patient to delineate anatomy and functioning of the blood vessels, the genitourinary system, or the gastrointestinal tract. Two radiocontrast agents are presently in common use. Barium sulfate is given rectally for evaluation of the GI tract. Iodine, in multiple proprietary forms, is given by oral, vaginal, intra-arterial or intravenous routes; these radiocontrast agents absorb or scatter X-rays, in conjunction with the real-time imaging, allow demonstration of dynamic processes, such as peristalsis in the digestive tract or blood flow in arteries and veins.
Iodine contrast may be concentrated in abnormal areas more or less than in normal tissues and make abnormalities more conspicuous. Additionally, in specific circumstances, air can be used as a contrast agent for the gastrointestinal system and carbon dioxide can be used as a contrast agent in the venous system. CT imaging uses X-rays in conjunction with computing algorithms to image the body. In CT, an X-ray tube opposite an X-ray detector in a ring-shaped apparatus rotate around a patient, producing a computer-generated cross-sectional image. CT is acquired in the axial plane, with coronal and sagittal images produced by computer reconstruction. Radiocontrast agents are used with CT for enhanced delineation of anatomy. Although radiographs provide higher spatial resolution, CT can detect more subtle variations in attenuation of X-rays. CT exposes the patient to more ionizing radiation than a radiograph. Spiral multidetector CT uses 16, 64, 254 o
University of Sydney
The University of Sydney is an Australian public research university in Sydney, Australia. Founded in 1850, it was Australia's first university and is regarded as one of the world's leading universities; the university is colloquially known as one of Australia's sandstone universities. Its campus is ranked in the top 10 of the world's most beautiful universities by the British Daily Telegraph and The Huffington Post, spreading across the inner-city suburbs of Camperdown and Darlington; the university comprises 9 faculties and university schools, through which it offers bachelor and doctoral degrees. In 2018-19, the QS World University Rankings ranked Sydney as one of the world's top 25 most reputable universities, its graduates as the top 5 most employable in the world and first in Australia. Five Nobel and two Crafoord laureates have been affiliated with the university as graduates and faculty; the university has educated seven Australian prime ministers, two Governors-General of Australia, nine state governors and territory administrators, 24 justices of the High Court of Australia, including four chief justices.
Sydney has produced 110 Rhodes Scholars and several Gates Scholars. The University of Sydney is a member of the Group of Eight, CEMS, the Association of Pacific Rim Universities and the Worldwide Universities Network. In 1848, in the New South Wales Legislative Council, William Wentworth, a graduate of the University of Cambridge and Charles Nicholson, a medical graduate from the University of Edinburgh Medical School, proposed a plan to expand the existing Sydney College into a larger university. Wentworth argued that a state secular university was imperative for the growth of a society aspiring towards self-government, that it would provide the opportunity for "the child of every class, to become great and useful in the destinies of his country", it would take two attempts on Wentworth's behalf, before the plan was adopted. The university was established via the passage of the University of Sydney Act, on 24 September 1850 and was assented on 1 October 1850 by Sir Charles Fitzroy. Two years the university was inaugurated on 11 October 1852 in the Big Schoolroom of what is now Sydney Grammar School.
The first principal was John Woolley, the first professor of chemistry and experimental physics was John Smith. On 27 February 1858 the university received its Royal Charter from Queen Victoria, giving degrees conferred by the university rank and recognition equal to those given by universities in the United Kingdom. By 1859, the university had moved to its current site in the Sydney suburb of Camperdown. In 1858, the passage of the electoral act provided for the university to become a constituency for the New South Wales Legislative Assembly as soon as there were 100 graduates of the university holding higher degrees eligible for candidacy; this seat in the Parliament of New South Wales was first filled in 1876, but was abolished in 1880 one year after its second member, Edmund Barton, who became the first Prime Minister of Australia, was elected to the Legislative Assembly. Most of the estate of John Henry Challis was bequeathed to the university, which received a sum of £200,000 in 1889.
This was thanks in part due to William Montagu Manning who argued against the claims by British Tax Commissioners. The following year seven professorships were created: anatomy. A significant figure from 1927 to 1958, termed'Sydney's best known academic', was the Professor of Philosophy at the University John Anderson. A native of Scotland, Anderson's controversial views as a self-proclaimed Atheist and advocate of free thought in all subjects raised the ire of many to the point of being censured by the state parliament in 1943; the New England University College was founded as part of the University of Sydney in 1938 and separated in 1954 to become the University of New England. During the late 1960s, the University of Sydney was at the centre of rows to introduce courses on Marxism and feminism at the major Australian universities. At one stage, newspaper reporters descended on the university to cover brawls, secret memos and a walk-out by David Armstrong, a respected philosopher who held the Challis Chair of Philosophy from 1959 to 1991, after students at one of his lectures demanded a course on feminism.
The philosophy department split over the issue to become the Traditional and Modern Philosophy Department, headed by Armstrong and following a more traditional approach to philosophy, the General Philosophy Department, which follows the French continental approach. Under the terms of the Higher Education Act 1989 the following bodies were incorporated into the university in 1990: Sydney Branch of the Sydney Conservatorium of Music Cumberland College of Health Sciences Sydney College of the Arts of the Institute of the Arts Sydney Institute of Education of the Sydney College of Advanced Education Institute of Nursing Studies of the Sydney College of Advanced Education Guild Centre of the Sydney College of Advanced Education. Prior to 1981, the Sydney Institute of Education was the Sydney Teachers College; the Orange Agricultural College was transferred to the University of New England under the Act, but transferred to the University of Sydney in 1994, as part of the reforms to the University of New England undertaken by the University of New England Act 1993 and the Southern Cross University Act 1993.
In January 2005, the University of Sydney transferred the OAC to Charles Sturt University. In February 2007, the university agreed to acquire a portion of the land granted to St John's College to develop the Sydney
New Zealand is a sovereign island country in the southwestern Pacific Ocean. The country geographically comprises two main landmasses—the North Island, the South Island —and around 600 smaller islands. New Zealand is situated some 2,000 kilometres east of Australia across the Tasman Sea and 1,000 kilometres south of the Pacific island areas of New Caledonia and Tonga; because of its remoteness, it was one of the last lands to be settled by humans. During its long period of isolation, New Zealand developed a distinct biodiversity of animal and plant life; the country's varied topography and its sharp mountain peaks, such as the Southern Alps, owe much to the tectonic uplift of land and volcanic eruptions. New Zealand's capital city is Wellington. Sometime between 1250 and 1300, Polynesians settled in the islands that were named New Zealand and developed a distinctive Māori culture. In 1642, Dutch explorer Abel Tasman became the first European to sight New Zealand. In 1840, representatives of the United Kingdom and Māori chiefs signed the Treaty of Waitangi, which declared British sovereignty over the islands.
In 1841, New Zealand became a colony within the British Empire and in 1907 it became a dominion. Today, the majority of New Zealand's population of 4.9 million is of European descent. Reflecting this, New Zealand's culture is derived from Māori and early British settlers, with recent broadening arising from increased immigration; the official languages are English, Māori, NZ Sign Language, with English being dominant. A developed country, New Zealand ranks in international comparisons of national performance, such as quality of life, education, protection of civil liberties, economic freedom. New Zealand underwent major economic changes during the 1980s, which transformed it from a protectionist to a liberalised free-trade economy; the service sector dominates the national economy, followed by the industrial sector, agriculture. Nationally, legislative authority is vested in an elected, unicameral Parliament, while executive political power is exercised by the Cabinet, led by the prime minister Jacinda Ardern.
Queen Elizabeth II is the country's monarch and is represented by a governor-general Dame Patsy Reddy. In addition, New Zealand is organised into 11 regional councils and 67 territorial authorities for local government purposes; the Realm of New Zealand includes Tokelau. New Zealand is a member of the United Nations, Commonwealth of Nations, ANZUS, Organisation for Economic Co-operation and Development, ASEAN Plus Six, Asia-Pacific Economic Cooperation, the Pacific Community and the Pacific Islands Forum. Dutch explorer Abel Tasman sighted New Zealand in 1642 and named it Staten Land "in honour of the States General", he wrote, "it is possible that this land joins to the Staten Land but it is uncertain", referring to a landmass of the same name at the southern tip of South America, discovered by Jacob Le Maire in 1616. In 1645, Dutch cartographers renamed the land Nova Zeelandia after the Dutch province of Zeeland. British explorer James Cook subsequently anglicised the name to New Zealand. Aotearoa is the current Māori name for New Zealand.
It is unknown whether Māori had a name for the whole country before the arrival of Europeans, with Aotearoa referring to just the North Island. Māori had several traditional names for the two main islands, including Te Ika-a-Māui for the North Island and Te Waipounamu or Te Waka o Aoraki for the South Island. Early European maps labelled the islands North and South. In 1830, maps began to use North and South to distinguish the two largest islands and by 1907 this was the accepted norm; the New Zealand Geographic Board discovered in 2009 that the names of the North Island and South Island had never been formalised, names and alternative names were formalised in 2013. This set the names as North Island or Te Ika-a-Māui, South Island or Te Waipounamu. For each island, either its English or Māori name can be used. New Zealand was one of the last major landmasses settled by humans. Radiocarbon dating, evidence of deforestation and mitochondrial DNA variability within Māori populations suggest New Zealand was first settled by Eastern Polynesians between 1250 and 1300, concluding a long series of voyages through the southern Pacific islands.
Over the centuries that followed, these settlers developed a distinct culture now known as Māori. The population was divided into iwi and hapū who would sometimes cooperate, sometimes compete and sometimes fight against each other. At some point a group of Māori migrated to Rēkohu, now known as the Chatham Islands, where they developed their distinct Moriori culture; the Moriori population was all but wiped out between 1835 and 1862 because of Taranaki Māori invasion and enslavement in the 1830s, although European diseases contributed. In 1862 only 101 survived, the last known full-blooded Moriori died in 1933; the first Europeans known to have reached New Zeala
Elizabeth II is Queen of the United Kingdom and the other Commonwealth realms. Elizabeth was born in London as the first child of the Duke and Duchess of York King George VI and Queen Elizabeth, she was educated at home, her father acceded to the throne on the abdication of his brother King Edward VIII in 1936, from which time she was the heir presumptive. She began to undertake public duties during the Second World War, serving in the Auxiliary Territorial Service. In 1947, she married Prince Philip, Duke of Edinburgh, a former prince of Greece and Denmark, with whom she has four children: Charles, Prince of Wales; when her father died in February 1952, she became head of the Commonwealth and queen regnant of seven independent Commonwealth countries: the United Kingdom, Australia, New Zealand, South Africa and Ceylon. She has reigned as a constitutional monarch through major political changes, such as devolution in the United Kingdom, Canadian patriation, the decolonisation of Africa. Between 1956 and 1992, the number of her realms varied as territories gained independence and realms, including South Africa and Ceylon, became republics.
Her many historic visits and meetings include a state visit to the Republic of Ireland and visits to or from five popes. Significant events have included her coronation in 1953 and the celebrations of her Silver and Diamond Jubilees in 1977, 2002, 2012 respectively. In 2017, she became the first British monarch to reach a Sapphire Jubilee, she is the longest-lived and longest-reigning British monarch as well as the world's longest-reigning queen regnant and female head of state, the oldest and longest-reigning current monarch and the longest-serving current head of state. Elizabeth has faced republican sentiments and press criticism of the royal family, in particular after the breakdown of her children's marriages, her annus horribilis in 1992 and the death in 1997 of her former daughter-in-law Diana, Princess of Wales. However, support for the monarchy has been and remains high, as does her personal popularity. Elizabeth was born at 02:40 on 21 April 1926, during the reign of her paternal grandfather, King George V.
Her father, the Duke of York, was the second son of the King. Her mother, the Duchess of York, was the youngest daughter of Scottish aristocrat the Earl of Strathmore and Kinghorne, she was delivered by Caesarean section at her maternal grandfather's London house: 17 Bruton Street, Mayfair. She was baptised by the Anglican Archbishop of York, Cosmo Gordon Lang, in the private chapel of Buckingham Palace on 29 May, named Elizabeth after her mother, Alexandra after George V's mother, who had died six months earlier, Mary after her paternal grandmother. Called "Lilibet" by her close family, based on what she called herself at first, she was cherished by her grandfather George V, during his serious illness in 1929 her regular visits were credited in the popular press and by biographers with raising his spirits and aiding his recovery. Elizabeth's only sibling, Princess Margaret, was born in 1930; the two princesses were educated at home under the supervision of their mother and their governess, Marion Crawford.
Lessons concentrated on history, language and music. Crawford published a biography of Elizabeth and Margaret's childhood years entitled The Little Princesses in 1950, much to the dismay of the royal family; the book describes Elizabeth's love of horses and dogs, her orderliness, her attitude of responsibility. Others echoed such observations: Winston Churchill described Elizabeth when she was two as "a character, she has an air of authority and reflectiveness astonishing in an infant." Her cousin Margaret Rhodes described her as "a jolly little girl, but fundamentally sensible and well-behaved". During her grandfather's reign, Elizabeth was third in the line of succession to the throne, behind her uncle Edward and her father. Although her birth generated public interest, she was not expected to become queen, as Edward was still young. Many people believed he would have children of his own; when her grandfather died in 1936 and her uncle succeeded as Edward VIII, she became second-in-line to the throne, after her father.
That year, Edward abdicated, after his proposed marriage to divorced socialite Wallis Simpson provoked a constitutional crisis. Elizabeth's father became king, she became heir presumptive. If her parents had had a son, she would have lost her position as first-in-line, as her brother would have been heir apparent and above her in the line of succession. Elizabeth received private tuition in constitutional history from Henry Marten, Vice-Provost of Eton College, learned French from a succession of native-speaking governesses. A Girl Guides company, the 1st Buckingham Palace Company, was formed so she could socialise with girls her own age, she was enrolled as a Sea Ranger. In 1939, Elizabeth's parents toured the United States; as in 1927, when her parents had toured Australia and New Zealand, Elizabeth remained in Britain, since her father thought her too young to undertake public tours. Elizabeth "looked tearful", they corresponded and she and her parents made the first royal transatlantic telephone call on 18 May.
In September 1939, Britain entered the Second World War. Lord Hailsham suggested that the two princesses should be evacuated to Canada to avoid the frequent aerial bombing; this was rejected by Elizabeth's mother. I won't leave wit