Percent signal ghosting

Russian translation: процентный уровень ложного сигнала ("призрака")

15:20 Jul 11, 2020
English to Russian translations [PRO]
Medical - Medical: Instruments
English term or phrase: Percent signal ghosting
There are seven quantitative tests made using measurements on the digital data. They are:
1. Geometric accuracy
2. High contrast spatial resolution
3. Slice thickness accuracy
4. Slice position accuracy
5. Image intensity uniformity
6. Percent signal ghosting
7. Low contrast object detectability
Николай
Russian Federation
Local time: 00:05
Russian translation:процентный уровень ложного сигнала ("призрака")
Explanation:
The percent signal ghosting test assesses the *level* of ghosting
A failure of this test means that there is signal ghosting at a level significantly higher than that observed in a properly
functioning scanner.
...value for the ghosting, as a fraction of the primary signal,
Using the system’s ROI tool, five intensity measurements are made: the average intensity in the primary image of the phantom, and the
average intensity in the background at four locations outside of the phantom.
... So, two of the background ROIs will sample the ghost
signal and two will be free of ghost signal.
Selected response from:

hawkwind
Russian Federation
Local time: 07:05
Grading comment
4 KudoZ points were awarded for this answer



Summary of answers provided
3 +1процентная степень смазанности сигнала
mk_lab
4процентный уровень ложного сигнала ("призрака")
hawkwind
3доля артефактов изображения в процентах
svetlana cosquéric


  

Answers


47 mins   confidence: Answerer confidence 3/5Answerer confidence 3/5 peer agreement (net): +1
percent signal ghosting
процентная степень смазанности сигнала


Explanation:
степень смазанности МРТ-сигнала в процентах

Т.е., процент растяжения/сокращения МРТ-сигнала из-за артефактов движения

Ghosting (medical imaging)
https://en.wikipedia.org/wiki/Ghosting_(medical_imaging)
Ghosting is an artifact that occurs in MRI when the object is extended along the direction of motion. The errors that are caused in the Magnetic Resonance Imaging (MRI) as a consequence of environmental factors or human body (such as blood flow, implants etc.), is known as Ghosting. Ghosting is a multidimensional artifact that occurs in the MRI in the phase encoded direction (short axis of the image) after applying the Fourier Transform.

When the phase of the magnetic resonance signal is being encoded into the 2-D or 3-D Fourier image, a mild deviation from the actual phase and amplitude may occur. This incompatibility of parameters is the cause of ghosting. The reasons for ghosting could be the physical factors such as temperature or humidity of the environment, movement caused by the patient or in the patient’s body. There are 2 types of movement that could result in ghosting as described below

Магнитно-резонансная томография
Артефакты в МРТ
https://portal.edu.asu.ru/pluginfile.php/150790/mod_resource...
Техническое качество МРТ изображения подразумевает отсутствие артефактов. Наиболее распространены: артефакты движения (смазанность) в связи с невозможностью пациента лежать неподвижно

Анализ артефактов изображений в компьютерной томографии
https://cyberleninka.ru/article/n/analiz-artefaktov-izobrazh...
В области малого таза были обнаружены только артефакты, вызванные движением пациента (смазанное изображение).

mk_lab
Ukraine
Local time: 23:05
Works in field
Native speaker of: Native in RussianRussian, Native in UkrainianUkrainian
PRO pts in category: 960

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21 hrs   confidence: Answerer confidence 4/5Answerer confidence 4/5
percent signal ghosting
процентный уровень ложного сигнала ("призрака")


Explanation:
The percent signal ghosting test assesses the *level* of ghosting
A failure of this test means that there is signal ghosting at a level significantly higher than that observed in a properly
functioning scanner.
...value for the ghosting, as a fraction of the primary signal,
Using the system’s ROI tool, five intensity measurements are made: the average intensity in the primary image of the phantom, and the
average intensity in the background at four locations outside of the phantom.
... So, two of the background ROIs will sample the ghost
signal and two will be free of ghost signal.

hawkwind
Russian Federation
Local time: 07:05
Specializes in field
Native speaker of: Native in RussianRussian
PRO pts in category: 1928
Login to enter a peer comment (or grade)

1 day 23 hrs   confidence: Answerer confidence 3/5Answerer confidence 3/5
percent signal ghosting
доля артефактов изображения в процентах


Explanation:
процентная доля артефактов изображения


https://www.cis.rit.edu/htbooks/mri/chap-11/chap-11-r.htm

https://cyberleninka.ru/article/n/analiz-artefaktov-izobrazh...





svetlana cosquéric
France
Local time: 22:05
Native speaker of: Native in RussianRussian
PRO pts in category: 75
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