Decreasing the thickness of the crystal improves resolution, though it also decreases the efficiency of detection. The other options would actually decrease the spatial resolution of the camera
Decreasing the thickness of the scintillation crystal
None of the other choices
Increasing the distance between the patient and the camera
Decreasing the length of the lead septa in the collimator
Increasing the distance between the lead septa in the collimator
They differ only in numbers of neutrons, which makes their atomic mass differ but not their chemical behavior
I, II, and III
I and III
I and II
II and III
All are true.
PET is not based on a projection modality, though SPECT is. PET does not require the use of collimators, though SPECT does.
I, II, and III.
I and II.
I and III.
At high atomic numbers the number of neutrons tends to be larger than the number of protons.
II and III.
CT uses x-rays and Nuclear Medicine uses gamma rays, both being high energy photons whose spectra actually overlap.
CT generally images anatomy with relatively high resolution and Nuclear Medicine generally images physiological function with relatively low resolution.
All are true
CT relies on transmission through the body and Nuclear Medicine on emission from within the body.
Both modalities involve radiation risk to the patien
All statements are true.
In nuclear medicine, attenuation is unwanted, since the total radioactivity is the desired imaging parameter. In CT or planar X-ray images, radiation is introduced from outside and attenuation measured.
one ore more crystals are used to convert high energy photons into light photons.
signal can be increased by increasing the radiation dose
tomographic slices may be reconstructed by combining radiation detected along multiple linear paths
attenuation by tissue is the desired imaging parameter.
electromagnetic radiation, not particulate radiation, is used to image.
Individual gamma photons are indeed counted and located.
Lead septa are required to generate a projection image
Average rates, rather than individual counts, of the gamma photons are all that are measured.
Multiple photomultiplier tubes are arranged in a grid behind a large crystal that act in concert to determine the location of the incoming photons with a spatial resolution greater than that of the tubes.
Each gamma particle produces a scintillation consisting of many light photons.
The contribution from Compton scattering to the image is reduced by analyzing the pulse height of the combined responses of the photomultiplier tubes to each detected gamma particle.
The primarily anatomical higher-resolution information from the CT scanner is combined with the primarily physiological lower-resolution information from the PET scanner.
The CT scanner is used to determine the attenuation along each Line of Response in the PET scanner.
Virtually every PET scanner sold today also contains a CT scanner.
The primarily anatomical, lower-resolution information from the CT scanner is combined with the primarily physiological, higher-resolution information from the PET scanner.
Registration of the two imaging modalities is greatly facilitated since the patient only needs to be slid a short distance between the actual scanners.
Statement II is false. This is an example of metastable isomeric transition, not beta-decay
: The primarily anatomical higher-resolution information from the CT scanner is combined with the primarily physiological lower-resolution information from the PET scanner.
The primarily physiological, higher-resolution information from the CT scanner is combined with the primarily anatomical, lower-resolution information from the PET scanner.
The CT scanner is used to determine the attenuation along each Line of Response in the PET scanner
Lead septa are indeed required to generate a projection image.
Lead septa are not required to generate a projection image.
Individual gamma photons are counted and located.
They are unstable because they have too few neutrons.
They include atoms with low atomic number typically found in normal organic molecules, such as carbon and oxygen.
Their decay leads to the generation of antimatter and subsequently to the creation of two 511 keV gamma photons moving in directions approximately 180 degrees apart.
They are used in devices that nowadays typically also contain a CT scanner.
너는 정확하게 대답했다.
당신이 잘못 대답했습니다.
너는 시간이 없어.
점수 또는 평점을 저장하려면 로그인하거나 등록해야합니다.
텍스트에 적합한 오디오 언어를 설정하십시오.
단어를 강조 표시하여 학습을 향상시킵니다.
로그인 할 필요없이 퀴즈, 코스 및 플래시 카드를 재생할 수 있습니다. 그러나 점수를 저장하고 퀴즈, 코스 및 플래시 카드를 만들려면 로그인해야합니다. 오디오를 재생하려면 전문 계정에 로그인해야합니다.
학습을 한 차원 높여보십시오. 프로페셔널 계정으로 업그레이드하면 질문을 큰소리로 듣고 다른 많은 혜택을 누릴 수 있습니다.
귀하가 작성한 질문이나 답변에 대한 오디오가 생성됩니다.
많은 사람들이 그들이 배운 것을 듣고 더 잘 배웁니다. 외국어 학습을 위해 우리는 18 개 이상의 언어를 지원했습니다.
지원 언어로는 덴마크어, 네덜란드어, 영어, 프랑스어, 독일어, 아이슬란드 어, 이탈리아어, 일본어, 한국어, 노르웨이어, 폴란드어, 포르투갈어, 루마니아어, 러시아어, 스페인어, 스웨덴어, 터키어, 웨일스 어 등이 있습니다.
또한 단어를 소리내어 읽음으로써 자동 단어 단위 강조 기능을 지원합니다.
Apple App Store에서 볼 Topgrade 응용 프로그램을 선택하십시오.
Google Play에서 볼 수있는 Topgrade 앱을 선택합니다.