Radiology: Are you still worried about whether the CT high-density lesions are bleeding or calcification?

At this stage, CT has been widely used to describe calcification and bleeding
.

The CT attenuation value measured in Hounsfield units is determined by the relationship between the linear attenuation coefficient of the pixel and the linear attenuation coefficient of water

At this stage, CT has been widely used to describe calcification and bleeding

Compared with CT, MRI shows higher brain parenchymal contrast

Recently, a study published in the journal Radiology explored the relationship between metal concentration, CT attenuation and magnetic susceptibility in paramagnetic and diamagnetic models, and the relationship between the CT attenuation and magnetic susceptibility of paramagnetic and diamagnetic brain tissue structures.

This retrospective study performed QSM CT and MRI scans on gadolinium and calcium models, patients, and healthy volunteers from June 2016 to September 2017

A total of 84 patients (mean age 64.

Fig.
1 CT scan (top) and quantitative susceptibility imaging (bottom) show normal structural regions of interest (putamen, globus pallidus, caudate nucleus, choroid plexus, substantia nigra, red nucleus and dentate nucleus)
.

Fig.
1 CT scan (top) and quantitative susceptibility imaging (bottom) show normal structural regions of interest (putamen, globus pallidus, caudate nucleus, choroid plexus, substantia nigra, red nucleus and dentate nucleus)
.

 

 

Figure 2 Image: A 42-year-old man undergoing surgery and chemotherapy for anaplastic astrocytoma
.

The CT plain scan image (left) shows the high attenuation area (arrow) of the radiation coronal area

Figure 2 Image: A 42-year-old man undergoing surgery and chemotherapy for anaplastic astrocytoma

In summary, the CT attenuation value of globus pallidus and hemorrhagic lesions is positively correlated with magnetic sensitivity, and the CT attenuation value of choroidal plexus and calcified lesions is negatively correlated with sensitivity

Original source:

Sonoko Oshima , Yasutaka Fushimi , Tomohisa Okada ,et al.

Oshima SONOKO , Yasutaka Fushimi , Tomohisa Okada , et Al.
Brain MRI with Quantitative Susceptibility Mapping: Relationship to CT Attenuation Values .
DOI: 10.
1148 / radiol.
2019182934 10.
1148 / radiol.
2019182934 in this message