Clinical feasibility of pulmonary perfusion analysis using dynamic computed tomography and a gamma residue function.

Purpose: To create and determine the clinical feasibility of a model based on dynamic computed tomography (CT) and a bolus injection of iodine contrast medium for evaluation of pulmonary perfusion for healthy individuals and for patients with lung diseases.

Materials And Methods: We analyzed pulmonary perfusion by means of dynamic 16-row multidetector CT scanning with a gamma residue function with adding a linear component (extended gamma function model) for 20 healthy individuals and in five patients.

Results: Four types of the time-attenuation curve (TAC) were identified for the peripheral lung.

Pallidoreticular damage in acute carbon monoxide poisoning: diffusion-weighted MR imaging findings.

We describe a case of carbon monoxide poisoning that led to pallidoreticular damage and delayed leukoencephalopathy. Serial diffusion-weighted MR imaging was performed. A restricted water diffusion pattern was demonstrated in the globus pallidus and substantia nigra in the early stage.

Sequential MR imaging and SPECT studies in herpes simplex encephalitis with crossed cerebellar hyperperfusion.

We report a case of herpes simplex encephalitis in which sequential MR imaging and SPECT studies showed interesting findings. SPECT in the acute stage showed wide increased uptake in the left cerebral hemisphere, as well as increased uptake in the contralateral right cerebellar hemisphere. T1-weighted images in the subacute stage showed hyperintense signals along the cerebral cortices, but T2*-weighted gradient-echo images did not show any signal decrease caused by the magnetic susceptibility effect of hemoglobin degradation.

[Evaluation of the results of radiotherapy for carcinoma involving the external auditory canal or middle ear].

Purpose: To evaluate the results and significance of radiotherapy for carcinoma involving the external auditory canal or middle ear.

Materials And Methods: Six patients underwent radiotherapy. Five patients had squamous cell carcinoma and one had ceruminous adenocarcinoma.