HARP (algorithm)

Harmonic phase (HARP) algorithm is a medical image analysis technique capable of extracting and processing motion information from tagged magnetic resonance image (MRI) sequences. It was initially developed by N. F. Osman and J. L. Prince at the Image Analysis and Communications Laboratory at Johns Hopkins University. The method uses spectral peaks in the Fourier domain of tagged MRI, calculating the phase images of their inverse Fourier transforms, which are called harmonic phase (HARP) images. The motion of material points through time is then tracked, under the assumption that the HARP value of a fixed material point is time-invariant. The method is fast and accurate, and has been accepted as one of the most popular tagged MRI analysis methods in medical image processing.

Background

In cardiac magnetic resonance imaging, tagging techniques make it possible to capture and store the motion information of myocardium in vivo. MR tagging uses a special pulse sequence to create temporary features – tags in the myocardium. Tags deform together with the myocardium as the heart beats and are captured by MR imaging. Analysis of the motion of the tag features in many images taken from different orientations and at different times can be used to track material points in the myocardium. Tagged MRI is widely used to develop and refine models of normal and abnormal myocardial motion to better understand the correlation of coronary artery disease with myocardial motion abnormalities and the effects of treatment after myocardial infarction. However, suffered from long imaging and post-processing times, tagged MRI was slow in entering into routine clinical use until the HARP algorithm was developed and published in 1999.

Algorithm

In mathematics and computer science, an algorithm (ⁱ/ˈælɡərɪðəm/ AL-gə-ri-dhəm) is a self-contained step-by-step set of operations to be performed. Algorithms exist that perform calculation, data processing, and automated reasoning.

The words 'algorithm' and 'algorism' come from the name al-Khwārizmī. Al-Khwārizmī (Persian: خوارزمي‎‎, c. 780-850) was a Persian mathematician, astronomer, geographer, and scholar.

An algorithm is an effective method that can be expressed within a finite amount of space and time and in a well-defined formal language for calculating a function. Starting from an initial state and initial input (perhaps empty), the instructions describe a computation that, when executed, proceeds through a finite number of well-defined successive states, eventually producing "output" and terminating at a final ending state. The transition from one state to the next is not necessarily deterministic; some algorithms, known as randomized algorithms, incorporate random input.

Algorithm (disambiguation)

An algorithm is a self-contained step-by-step set of operations to be performed.

Algorithm may also refer to:

See also

Medical algorithm

A medical algorithm is any computation, formula, statistical survey, nomogram, or look-up table, useful in healthcare. Medical algorithms include decision tree approaches to healthcare treatment (e.g., if symptoms A, B, and C are evident, then use treatment X) and also less clear-cut tools aimed at reducing or defining uncertainty.

Scope

Medical algorithms are part of a broader field which is usually fit under the aims of medical informatics and medical decision making. Medical decisions occur in several areas of medical activity including medical test selection, diagnosis, therapy and prognosis, and automatic control of medical equipment.

In relation to logic-based and artificial neural network-based clinical decision support system, which are also computer applications to the medical decision making field, algorithms are less complex in architecture, data structure and user interface. Medical algorithms are not necessarily implemented using digital computers. In fact, many of them can be represented on paper, in the form of diagrams, nomographs, etc.

Gargantua (solitaire)

Gargantua is a solitaire card game that is basically a version of Klondike using two decks. It is also known as Jumbo in AisleRiot Solitaire (which is part of the GNOME Desktop).

Rules

Instead of seven in Klondike, there are nine tableau piles to be formed. Forming these nine tableau piles of cards, i.e. dealing the cards, is like much like Klondike. One face-up card is placed on the first column, then eight cards are each placed face-down on the other eight tableau piles. Over these eight face-down cards are one face-up card and seven face-down cards, and so on until all nine tableau piles have a face-up card. The rest of the deck becomes the stock. The foundation/tableau should look like this:

As in Klondike, play consists of the following:

Harp (magazine)

Harp was a print and online magazine that provided in-depth information on current music, mainly the adult album alternative genre, which encompasses a large variety of music. It was published from 2001 to 2008. The sister publication of Harp was Jazz Times.

History and profile

Harp was founded by Scott Crawford in 2001. The magazine was published on a bimonthly basis. The headquarters was in Silver Spring, Maryland. By 2008, Harp had moved well beyond its early AAA roots to become a more general interest magazine (compared in the media to such publications as Mojo, Uncut, Spin, and Paste and Blender) with emphasis on the following genres: indie rock, pop, punk, Americana, psychedelia, and assorted underground subgenres. It was published eight times annually.

On March 17, 2008, Guthrie, Inc., the company that published Harp, officially announced that it would be suspending publication immediately. The last issue sent to subscribers and newsstands was the March/April issue featuring Dave Grohl on the cover. In a note to subscribers the publishers indicated that their assets and financial records were being submitted to bankruptcy courts. The demise of Harp came on the heels of a similar announcement by No Depression and a number of other print magazines covering music. Staff of the magazine went on to found Blurt.

Harp (surname)

Harp is a surname. Notable people with the surname include: