dcstats: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/dcstats - from package: dicom3tools

You may install the required package with command apt-get install {package}

Error in other languages:
dcstats: bevel nie gevind nie
dcstats: comandă negăsită
dcstats: comando não encontrado
dcstats: commande introuvable
dcstats: command not found
dcstats: käsku ei ole
dcstats: không tìm thấy lệnh
dcstats: komanda nerasta
dcstats: Kommando nicht gefunden.
dcstats: kommandot finns inte
dcstats: komut yok
dcstats: nie znaleziono polecenia
dcstats: níor aimsíodh an t-ordú
dcstats: no se encontró la orden
dcstats: no s'ha trobat l'ordre
dcstats: opdracht niet gevonden
dcstats: parancs nem található
dcstats: perintah tidak ditemukan
dcstats: príkaz nenájdený
dcstats: příkaz nenalezen
dcstats: команда не найдена
dcstats: командата не е открита
dcstats: 命令找不到
dcstats: コマンドが見つかりません