scholarly journals Double density hematoma: Low density area encountered around high density lesions in cases of acute cerebral hematoma.

Nosotchu ◽  
1997 ◽  
Vol 19 (2) ◽  
pp. 98-102
Author(s):  
Yoshihiro Hashimoto ◽  
Ryuichi Tsugane ◽  
Tsuyoshi Yamaguchi ◽  
Futoshi Takei ◽  
Osamu Satou
Keyword(s):  
High Density ◽  
Low Density ◽  
Density Area ◽  
Cerebral Hematoma ◽  
Low Density Area

The natural regulation of giant tortoise populations on Aldabra Atoll: recruitment

1979 ◽  
Vol 286 (1011) ◽  
pp. 177-188 ◽  
Keyword(s):  
High Density ◽  
Annual Rainfall ◽  
Egg Mass ◽  
First Year ◽  
Low Density ◽  
Isolated Populations ◽  
High Density Population ◽  
Density Area ◽  
Low Density Area ◽  
Density Population

The reproductive ecology of the giant tortoise ( Geochelone gigantea Schweigger) in three isolated populations was studied for 2 years on Aldabra Atoll. Density-dependent recruitment was demonstrated. Nest destruction in the low density area was dependent on the density of mature females providing a mechanism for regulating population size. Increases in annual rainfall and the resultant increase in food availability induced an increase in mean egg mass in the low density area (and thereby total hatchling production), whereas in the high density population mean clutch size, mean egg mass, total number of nests and total hatchling production all increased significantly. Large eggs produced large hatchlings which survived better during the first year than hatchlings from small eggs. Hatchling mortality was 94 and 81 % in the first year in the high and low density populations respectively. Recruitment into the 5 year age class (after which predation is considered negligible) had almost ceased in the high density population compared with 0.44 per 100 breeding females per year in the low density population.

USING TELEMEDICINE TECHNOLOGIES IN RADIOLOGY FOR LOW-DENSITY AREA

2017 ◽  
Vol 53 (1) ◽  
pp. 4-4
Author(s):  
T.S. Smal ◽  
◽  
V.D. Zavadovskaya ◽  
I.A. Deyev ◽  
◽  
...  
Keyword(s):  
Low Density ◽  
Density Area ◽  
Low Density Area

Prognostic significance of the pretreatment CT scan on time to progression for patients with malignant gliomas

1980 ◽  
Vol 52 (5) ◽  
pp. 642-647 ◽  
Author(s):  
Victor A. Levin ◽  
William F. Hoffman ◽  
David C. Heilbron ◽  
David Norman
Keyword(s):  
Ct Scan ◽  
Tumor Progression ◽  
Probability Model ◽  
Malignant Gliomas ◽  
Prognostic Significance ◽  
Low Density ◽  
Midline Shift ◽  
Time To Progression ◽  
Density Area ◽  
Low Density Area

✓ Case histories of 61 patients receiving multimodality therapy for primary malignant brain tumors were reviewed for factors visible on the computerized tomography (CT) scan that correlated with the interval of time from diagnosis and pretherapy evaluation to the time of documented tumor progression. The initial pretreatment CT scan of each patient was reviewed. Midline shift, peritumor low density (edema), the greatest diameter of tumor enhancement, and the greatest diameter of the intratumor low-density area were measured prior to radiation therapy and chemotherapy. Using a Weibull survival probability model, time to tumor progression was most satisfactorily fitted using two covariates, the volume of enhancing tumor (for instance, contrast-enhancing tumor less intratumor low density), and the presence of a peritumor low-density area. Patients who exhibited a small amount of contrast-enhancing tumor with peritumor low density tended to have a longer time to progression than patients with large contrast-enhancing tumor volume and no peritumor low density. Midline shift was not as important a variable as the extent of tumor contrast enhancement or peritumor low density.

scholarly journals 300 A evaluation of the Cine film : The trial of improvement on image quality in low density area

1995 ◽  
Vol 51 (10) ◽  
pp. 1371
Author(s):  
SATORU TAKATA ◽  
ATSUSHI ONO ◽  
KEIICHI MICHIDA ◽  
MAKOTO ISHII ◽  
MASAKI HATTORI ◽  
...  
Keyword(s):  
Image Quality ◽  
Low Density ◽  
Density Area ◽  
Cine Film ◽  
Low Density Area

Meaning and significance of low density area (LDA) of renal cell carcinoma (RCC) on computed tomography (CT).

2018 ◽  
Vol 36 (6_suppl) ◽  
pp. 628-628
Author(s):  
Keita Shibayama ◽  
Go Kimura ◽  
Tatsuro Hayashi ◽  
Jun Akatsuka ◽  
Ryoji Kimata ◽  
...  
Keyword(s):  
Prognostic Significance ◽  
Nippon Medical School ◽  
Rank Test ◽  
Low Density ◽  
Pathological Features ◽  
Hydropic Degeneration ◽  
Central Necrosis ◽  
Density Area ◽  
Group A ◽  
Low Density Area

628 Background: LDA in solid RCC on CT is often interpreted as ‘central necrosis’ in routine clinical practice. However, the details of clinicopathological (CP) features of LDA of RCC on CT and their prognostic significance have not been shown. We retrospectively investigated LDA of RCC to clarify the CP features and prognostic significance. Methods: Of 428 surgically treated patients for RCC between January 2007 and March 2017 at Nippon Medical School hospital, we found 267 cases who had dynamic CT performed before operation. Among them, we selected and analyzed 199 consecutive cases whose tumor had low density area and whose cancer status resulted in no evidence of disease after surgery. We first examined pathological features of LDA. Then, we examined the correlation between pathological features of LDA and CP parameters and prognosis. The differences of values between the three groups were examined with the Kruskal-Wallis test. Recurrence free survival (RFS) was examined with the Kaplan-Meyer curves and the log-rank test. Results: The histology of LDA was divided into two groups: central necrosis (+) or (-: NN). Central necrosis (+) group was further divided into two subgroups: with neutrophilic infiltration (NI+) and without NI (NI-). This means that, in the end, there were three groups according to microscopic findings: group A (NI+, n = 20, 10%), B (NI-, n = 55, 28%), C (NN, n = 124, 62%). The pathological features of the NN group were composed of hyaline degeneration, hydropic degeneration, fibrosis, scars, and so on. The results of the comparison between CP parameters among the three groups were as follows: C-reactive protein, WBC, platelet, and alkaline phosphatase are statistically higher, and hemoglobin, triglyceride, and albumin were statistically lower in group A. CT value was statistically lower in group A and B. Median follow-up was 35months, and 3-year RFS (group A, B, C, p value) was (49.8%, 77.9%, 94.3%, p < 0.0001). Conclusions: In RCC patients only about one-third of LDA on CT was shown to be central necrosis. Necrosis with NI was clinically most closely associated with poor prognosis. Central necrosis may be predictive from lower CT values compared to non-necrotic tissues.

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